The feedtray issue has actually been discussed very heavily here and on other boards. On this board Ares eventually deleted all the threads containing these discussions directly after I posted a concept drawing of a modification to the feedtray to resolve this issue, and I was publicly accused of "encouraging unauthorized design modifications," whatever that means.
Virtually all users have reported extreme and rapid wear and divoting of the leading edge of the feeding bevel you're describing on aluminum feedtrays. Most report that eventually the wear rate slows as the material is ground away and the belt had less material to make contact with. Many users also report no mechanical problems caused by this wear. I know of users who are already on their second tray (paid for at full price) because of this wear as well.
The part is well known to be substandard, and it's generally accepted that Ares made the steel feedtrays an uber-expensive option-only purchase intetionally to recoup lost revenue caused by underestimating production costs of this platform. The aluminum trays are simply much cheaper to machine, and come "standard" on Shrikes because of a business decision. Most Shrike shooters will tell you that your upper will function fine with this tray, at least for several thousand rounds. But it will look ugly and shake your confidence after just a few dozen. YMMV