Quad 71 fins, and general quad tuning

[enrique-letelier]

Hello all,
I just got my new Quad boards and I´d like to get some help and imput concerning board tuning and fin size recommendations. I´ve got the 71, 81 and 86. So far I´ve only tried the 71 and the first thing that called my attention is that all boards, regardless of volume and width and tail surface are stocked with the same size fins. Could the fins be a little too big for the 71 in solid 4.5 wind? I did feel like I could use smaller fins front and back.
Another thing, how would you recommend moving around the back fins? How will the back fin size/position affect the board?
Thanks for the help!