Good to hear your news. I hope it works out well.
Just to clarify, slight wear on the front end of the tab, where it contacts the slide recess, is completely normal. After all, the tab in question serves as a locking lug - and friction occurs between the tab and the slide, as the barrel rotates to lock and unlock. It is basically the same principle as with the locking lugs on the bolt of a bolt-action rifle. Friction = wear....however, the wear should be relatively slight.