Yeah, Smaller center fin is an erBB classic to loosen up.If I want to add a bit of lift and looseness to a step-up - should I go with bigger or smaller fins? Currently have some medium "control" fiberglass fins in there.
The board design already feels pretty locked in with a good amount of v through the bottom. Wanted to add a little spark when it's not quite thumping.
When you say your fins are control, i asume you mean:
https://futuresfins.com/pages/control
If they are too stiff, it sounds to me like you want a different construction, something more like techflex or even honeycomb.
From the Techflex description:
“This engineered flex creates a vertical flex pattern, which enables you to maintain control and drive down the line while being lively and free off the lip.”