Estingo ,go for it ,we are all different! I like to experiment as well ,but always end up back with designers set up ,or slight variations there of.Particularly Jimmy's boards!I. IMO,trying to get twin fin performance from forward thruster,set ups does not work,they just do not drive as intended,and tend to skate all over the wave face .However I have not tried it on boards smaller than 8.5,I hope you get the feeling you are after ,let us know how it goes