Been lurking here since I bought my first crossbow a little over a month ago, an Ibex SMF.
Background on the bow and performance: it's all stock except for the Fast Flemish string I added about 60 shots ago. I finally got it stretched to where I'm at a 1 1/8" brace height and holding, and it's shooting really well. I'm grouping dead on at 20, 30 and 40 marks. For some reason, probably user error, best I can do is 3" off target in any direction at 50 yards. This is with a heavy bolt for my rig: Easton (Barnett) Headhunters at 425gr+, which I will be hunting with in a week and a half. Anyway, all of my shots on game will be well within 40 yards so it's good.

The question: how exactly do I know when my string serving needs replaced? After these 60 shots, there are definitely "claw marks" or impressions in the serving, mashed way down:

Now I don't see the raw string underneath it yet, but the strands in the serving are moving some - mashing in and to the sides a little around the claws. Is this normal and safe? If so, when is it no longer safe? What does that look like?
FWIW, I've been keeping it waxed regularly with the Bowning Seal-Tite (green tube silicon variety). Thanks in advance for the time and opinions!