Putting a file to my custom Brackenbury was tough. I thought about it for two years, even had the file in my hand several times and chickened out.
Finally, I figured it's got my name on it for Pete's sake, I might as well have it fit my hand! After that first bit of sawdust hit the floor there was no going back and I really got into it. I knocked down a corner in the palm swell that bothered me from day one. I sealed it with a little polyurethane and wiped the sweat from my brow. Whew! I'm no expert but it turned out just fine.
After that I tackled a longbow grip that was not right. Lots of filing, several wraps with electrical tape to build up a narrow part, and then covered the whole thing up with a rubber sleeve. It fits me perfectly and I shoot it much better. Rubber grips hide almost anything!
It's your bow, have at it!