Fin Setup

Hi there,
I've read the fin setup guide on the site and have done a bit research.
My longboard is a 9' 22" 2 3/4" performance board with 3 small fins. The fins, at least to me, seem a bit crappy. See pictures attached.
I am 5'9 and weight 175lbs.
It moves well, turns well and in the right conditions is great fun. I can't really get the noseriding down as yet, close but no cigar, and do have a bit of trouble in bigger waves. So I'm not sure if it's me not fully committing or maybe if a change of fin setup might help me catch more waves when it's a bit bigger.
I'm an advanced intermediate standard foot, left foot forward. Let's call it that. Been surfing for about 8 years, 3-4 times per month on beach breaks but have surfed points and other types of waves here in South Africa and abroad.
So given the setup I have below, will a 6",7" or 8" center fin help me:
a) Trim better
b) Make noseriding easier
c) Catch more waves when it's bigger.
d) an other advantages?
e) Disadvantages?
I understand a larger fin will make it slightly harder to turn but will provide more stability when riding.
So what's your take on these ideas and thanks in advance!
Pico Train
I've read the fin setup guide on the site and have done a bit research.
My longboard is a 9' 22" 2 3/4" performance board with 3 small fins. The fins, at least to me, seem a bit crappy. See pictures attached.
I am 5'9 and weight 175lbs.
It moves well, turns well and in the right conditions is great fun. I can't really get the noseriding down as yet, close but no cigar, and do have a bit of trouble in bigger waves. So I'm not sure if it's me not fully committing or maybe if a change of fin setup might help me catch more waves when it's a bit bigger.
I'm an advanced intermediate standard foot, left foot forward. Let's call it that. Been surfing for about 8 years, 3-4 times per month on beach breaks but have surfed points and other types of waves here in South Africa and abroad.
So given the setup I have below, will a 6",7" or 8" center fin help me:
a) Trim better
b) Make noseriding easier
c) Catch more waves when it's bigger.
d) an other advantages?
e) Disadvantages?
I understand a larger fin will make it slightly harder to turn but will provide more stability when riding.
So what's your take on these ideas and thanks in advance!
Pico Train