Transitioning from 8'0" Mini-mal to 6'6" Firewire Addvance?

Hey All,
I started surfing about 5 months ago (about 1-2 times a week) and am loving it. I'm 25 years old, 170lbs (77 kg), 5 ft 11 in. (180 cm). Pretty fit - lift weights regularly and swim 1-2 times a week (though still improving endurance).
I've been surfing a 8'0" 1993 Haut Mini-mal / funshape (closer to a mini-mal I think). Dimensions are 8' L x 22" W x 2 7/8" thick.
I surf in the San Francisco Bay Area (mostly messier beach breaks, unless I'm lucky enough to go to Santa Cruz. Waves can go anywhere from mushy knee high to double overhead but I don't go out when it's higher than overhead). Still very much a beginner, can catch about 5 or so unbroken waves going straight towards the beach (still learning to turn) in an hour if the waves are up to about shoulder high.
Found a 6'6" Firewire Addvance for $250 which seems like a good deal to me and am tempted to get it for learning how to turn and for when the waves are steeper (Can't duckdive my 8'0" making it hard to get out and find that I pearl too often in steeper choppy conditions).
Is 6'6" an ok size given the width/volume (21.5" W x 3" thick) or is it too small (local shaper recommended maybe going around 6'8"-6'10")? Is it too early for me to try this board out? Will the Firewire hold up in steeper conditions even though it's more of a high volume learner shortboard? And finally, is this board too high volume to duck dive?
Thanks!
I started surfing about 5 months ago (about 1-2 times a week) and am loving it. I'm 25 years old, 170lbs (77 kg), 5 ft 11 in. (180 cm). Pretty fit - lift weights regularly and swim 1-2 times a week (though still improving endurance).
I've been surfing a 8'0" 1993 Haut Mini-mal / funshape (closer to a mini-mal I think). Dimensions are 8' L x 22" W x 2 7/8" thick.
I surf in the San Francisco Bay Area (mostly messier beach breaks, unless I'm lucky enough to go to Santa Cruz. Waves can go anywhere from mushy knee high to double overhead but I don't go out when it's higher than overhead). Still very much a beginner, can catch about 5 or so unbroken waves going straight towards the beach (still learning to turn) in an hour if the waves are up to about shoulder high.
Found a 6'6" Firewire Addvance for $250 which seems like a good deal to me and am tempted to get it for learning how to turn and for when the waves are steeper (Can't duckdive my 8'0" making it hard to get out and find that I pearl too often in steeper choppy conditions).
Is 6'6" an ok size given the width/volume (21.5" W x 3" thick) or is it too small (local shaper recommended maybe going around 6'8"-6'10")? Is it too early for me to try this board out? Will the Firewire hold up in steeper conditions even though it's more of a high volume learner shortboard? And finally, is this board too high volume to duck dive?
Thanks!