I know it sounds like an absurd amount, but that's correct. With the inserts you're not going to have a lot of flexibility. You put it as close to stock as you can, and then try 1 hole forward and 1 hole back. Remember that if you move your bindings forward from stock, your fin probably needs to go forward as well. Vice versa for backwards. For example if your bindings are forward .150" from stock, try moving your fin forward .010". Bindings forward will probably help at 32 off and longer. At 35 off and shorter, it's harder to get width with bindings forward. You just need to experiment and find what works for you. I'm on a mid as well, and back .25 seems to work well for me. My driver likes the stock setting. If you don't have much water time to experiment, put it as close to stock as you can and ride it...