The shape of the grip has nothing to do with the draw length. It just might be you have one that isn't set up right from the factory and is ndeed drawing long. It doesn't really matter much. You just have to set up the bow so it feels right for you and measure the actual draw length at that module setting and remember it.
As for the cables getting frayed? Are you sure it's the cam and not just the modules. On mine I found that the module groove has a sharp edge on the side butting up against the cam which tends to cut the serving. As mentioned, a little time with a fine toothed file and 400 grit sandpaper takes care of the problem.
When you get the replacement parts you ight find the same thing happening. Pay particular attention to this area when you start shooting it again. Keep an eye on the cable serving and don't let it get frayed before you remedy the situation. Just replacing cables again is not a "fix".
If You're Not Living on the Edge You're Taking Up Too Much Space
Martin/Rytera Staff Shooter
PSAA Life member, UBP Life member
PADI AOW Diver