Walker project comp x 5.0

Alright I know I have been threating to get a new board forever but got a great deal on another walker project comp x 5.0
I love this board and it was a trade offer for a skim board purchase gone wrong
I will be purchasing a new skim soon
But in the meantime what can I put in it for smaller fins to change the ride to less surfy ride as I still have one set up with the stock fins
For reference I'm 230 and have had no problem surfing this on my centurion lighting ropeless with out ballast so I'm hoping after I add more ballast I can change the fins for a different ride
Thanks