Too much volume in a shortboard?

What have been your experiences surfing a shorter board with too much volume or a greater volume than is suggested for your weight? I'm 5'7" and 185lbs or 84kg.
I believe I'm making the classic mistake of surfing a groveller/small wave board with too much volume.
I have a hybrid fish is 6'6" x 21" x 2-3/4 in Tuflite with the thruster fin setup, link below:
https://www.surfshopsaustralia.com.au/s ... lying-fish
I find this board paddles okay and does well in small (knee-thigh) hollow waves. In bigger surf the board has a very narrow margin to catch waves, it doesn't get into waves as early as my 7'6" or 8'6" but actually does worse than my longer boards with late takeoffs since I cant angle the board and set my inside rail or else I will miss the wave. I can only catch the wave perpendicular, but then I get sucked up to the top of the wave and then finally rush down the face of the wave out of control, I can do the same thing with my 7'6" but that feels so much more stable and in control in those situations.
Of course paddle fitness always helps no matter what size board you are surfing, but I borrowed one of RinkyDink's short boards that was 6'4" x 19-3/8" x 2-1/2" with a squash tail and similar rocker and actually had an easier time with that board on my first day than after a dozen sessions on the fish. The 6'4" felt stable, in control, and even slower than the fish on the face. It paddles a little slower, catches waves a little later, but has a larger margin of error to catch waves under control.
On paper the fish should be easier to catch waves with and more stable for pop-ups, instead I found I could catch waves and had better stability with a lower volume standard shortboard. I have no doubt if I had my fish in 7'6" size I would be able to paddle into waves earlier and perhaps avoid getting sucked up the face and the out of control take offs, but it wouldn't surf like it was designed to for a person of my weight. Conversely, do you think that the 6'6" is a bad size for me and would have been better off with a smaller size board?
Too much volume, too little volume, or that "bad" in between volume? Bottom contour design?
I don't think I will be keeping this board and I'm thinking about a high performance longboard around 8'-9' to use on smaller waves (knee-chest) and maybe a larger standard shaped shortboard 6'4" to 6'8" for larger or hollow waves (waist-head).
Similar forum topics on grovelers, too much volume, and bad volume that I used as a point of reference are below:
viewtopic.php?t=24087
viewtopic.php?t=24680
viewtopic.php?f=9&t=26100
viewtopic.php?t=24991
Quiver:
8'6" Southpoint Longboard
7'6" CI M-13
6'6" MR Flying Fish
Age: 33
Height: 5'7"
Weight: 185lbs
Experience: 20 months surfing 6-8x per month
Surfs: Beach breaks with sandbars and sometimes rocky beach breaks.
I believe I'm making the classic mistake of surfing a groveller/small wave board with too much volume.
I have a hybrid fish is 6'6" x 21" x 2-3/4 in Tuflite with the thruster fin setup, link below:
https://www.surfshopsaustralia.com.au/s ... lying-fish
I find this board paddles okay and does well in small (knee-thigh) hollow waves. In bigger surf the board has a very narrow margin to catch waves, it doesn't get into waves as early as my 7'6" or 8'6" but actually does worse than my longer boards with late takeoffs since I cant angle the board and set my inside rail or else I will miss the wave. I can only catch the wave perpendicular, but then I get sucked up to the top of the wave and then finally rush down the face of the wave out of control, I can do the same thing with my 7'6" but that feels so much more stable and in control in those situations.
Of course paddle fitness always helps no matter what size board you are surfing, but I borrowed one of RinkyDink's short boards that was 6'4" x 19-3/8" x 2-1/2" with a squash tail and similar rocker and actually had an easier time with that board on my first day than after a dozen sessions on the fish. The 6'4" felt stable, in control, and even slower than the fish on the face. It paddles a little slower, catches waves a little later, but has a larger margin of error to catch waves under control.
On paper the fish should be easier to catch waves with and more stable for pop-ups, instead I found I could catch waves and had better stability with a lower volume standard shortboard. I have no doubt if I had my fish in 7'6" size I would be able to paddle into waves earlier and perhaps avoid getting sucked up the face and the out of control take offs, but it wouldn't surf like it was designed to for a person of my weight. Conversely, do you think that the 6'6" is a bad size for me and would have been better off with a smaller size board?
Too much volume, too little volume, or that "bad" in between volume? Bottom contour design?
I don't think I will be keeping this board and I'm thinking about a high performance longboard around 8'-9' to use on smaller waves (knee-chest) and maybe a larger standard shaped shortboard 6'4" to 6'8" for larger or hollow waves (waist-head).
Similar forum topics on grovelers, too much volume, and bad volume that I used as a point of reference are below:
viewtopic.php?t=24087
viewtopic.php?t=24680
viewtopic.php?f=9&t=26100
viewtopic.php?t=24991
Quiver:
8'6" Southpoint Longboard
7'6" CI M-13
6'6" MR Flying Fish
Age: 33
Height: 5'7"
Weight: 185lbs
Experience: 20 months surfing 6-8x per month
Surfs: Beach breaks with sandbars and sometimes rocky beach breaks.