Pretty much impossible to answer with so many variables of board design & personal preference on drive vs release...
If you'd said, hey I ordered this popout, I weigh X amount & surf these kinda waves.
People might have a chance of regurgitating some kind of BS for ya to sheep onto...if your board has sharp rails, more rail line & single into double concave it
might go alright with smaller fins...or not



You've put your trust in a bloke to build you a custom surfboard...go with whatever he recommends you.