I had the wide forearm problem as well. You can try to change the file itself but that might cause it too look funny. Its something you will have to play with. An example is my thighs for my spartan. They were VERY long originally so I had to shorten them without making them thinner. They looked a little funky at first but I messed with it enough to make it look normal but still fit well. Another option is to put some upholstery foam inside to pad it out and give a snug fit. I did that with mine. I will probably have to redo the foam since I did it with hot glue. The foam feels like its coming off after a few uses putting my hand through it. Maybe e6000 will hold it well enough.