Difference between FISH 6.6 39Liters volume / 6.3 36Liters

Hello Surfers,
Little info about the user:
----------------------------------------------------------
1.85m
74KG
Intermediate
waves to be surfed: small, mushy, little power
7.6 epoxy board (works fine in these conditions)
----------------------------------------------------------
The question:
I would like a smaller board to be able to get better attached to the wave face, perhaps some turns, nothing ultra radical.
I am checking these two boards, epoxy and ok priced:
Brand: Torq
Material: Epoxy
Type: Modern fish
Lenght: 6.3
Liters: 36
or the variation
Lenght: 6.6
Liters: 39
I am planning to get the quad fin configuration.
Do you think it will be a big difference from 39 to 36? Should I go for the 6.3 or the 6.6?
Thanks for your very precious advice.
Johnny
Little info about the user:
----------------------------------------------------------
1.85m
74KG
Intermediate
waves to be surfed: small, mushy, little power
7.6 epoxy board (works fine in these conditions)
----------------------------------------------------------
The question:
I would like a smaller board to be able to get better attached to the wave face, perhaps some turns, nothing ultra radical.
I am checking these two boards, epoxy and ok priced:
Brand: Torq
Material: Epoxy
Type: Modern fish
Lenght: 6.3
Liters: 36
or the variation
Lenght: 6.6
Liters: 39
I am planning to get the quad fin configuration.
Do you think it will be a big difference from 39 to 36? Should I go for the 6.3 or the 6.6?
Thanks for your very precious advice.
Johnny