New noserider (9.6 Hap Jacobs)

Hi guys, I'm new around here. Not sure if there's an introduction topic... I will look it up 
I've been into longboarding for 22 years now (I'm 44), and I own a few boards, a small 5'10 fish retro board, a bigger 7.2 for big (ish) waves, an epoxy 9.1, a double stringer 9.6 made by a very good local shaper and I recently aquired a Surftech epoxy Hap Jacobs. It's a 9.6.
I previously had a Surftech epoxy 9.4 Robert August Wingnut model. Sold it to a friend (we usually surf together) and got the Hap Jacobs, they look pretty similar, but I had the Robert August for a few years now, I resprayed it due to a bad fix, and I didn't pay much more for the Hap Jacobs, which is in mint condition.
I found that the HJ, although longer than the RA has less volume, which I did not expect.
I cannot find a lot of information on these boards around the web, but I believe these are the measurements:
Hap Jacobs
Length - 9.6
Width - 22 1/2
Thickness - 2 7/8
Tail - 14 3/4
Nose - 18 7/8
Robert August
Length - 9.4
Width - 23 3/4
Thickness - 3
Tail - 14 1/2
Nose - 19
So I guess the Robert August has more volume... Am I worse off for nose riding? What would be the basic differences of surfing one or the other? Do you guys know the formula for calculating volume in liters?
Here are a couple pics. First the Robert August with the custom paint (red is original). Next the Hap Jacobs in light blue, and the hatchet fin it has right now.

I've been into longboarding for 22 years now (I'm 44), and I own a few boards, a small 5'10 fish retro board, a bigger 7.2 for big (ish) waves, an epoxy 9.1, a double stringer 9.6 made by a very good local shaper and I recently aquired a Surftech epoxy Hap Jacobs. It's a 9.6.
I previously had a Surftech epoxy 9.4 Robert August Wingnut model. Sold it to a friend (we usually surf together) and got the Hap Jacobs, they look pretty similar, but I had the Robert August for a few years now, I resprayed it due to a bad fix, and I didn't pay much more for the Hap Jacobs, which is in mint condition.
I found that the HJ, although longer than the RA has less volume, which I did not expect.
I cannot find a lot of information on these boards around the web, but I believe these are the measurements:
Hap Jacobs
Length - 9.6
Width - 22 1/2
Thickness - 2 7/8
Tail - 14 3/4
Nose - 18 7/8
Robert August
Length - 9.4
Width - 23 3/4
Thickness - 3
Tail - 14 1/2
Nose - 19
So I guess the Robert August has more volume... Am I worse off for nose riding? What would be the basic differences of surfing one or the other? Do you guys know the formula for calculating volume in liters?
Here are a couple pics. First the Robert August with the custom paint (red is original). Next the Hap Jacobs in light blue, and the hatchet fin it has right now.