I have the same problem with long blocks. What I do is go with a size larger on my inserts so the fingers will fit once they swell up. I just have the pro shop glue the front and sides of the inserts and put a shim between the back of the finger grip and the ball to tighten it up. You can use swizzle sticks, straws, or even a paper match stick as a shim.
--------------------
~~~SrK - Have balls, will travel