Ok, have anything specific or just what you have put into above. The issuesyou mention I think fall into what would be considered a proper installation.

I want to add that I have used an aftermarket adapter for the rear(A2Z universal) and after properly installing, it has worked excellent without any problems this season, with the Disc brakes performing better than any brake i have used in the past. This adapter clamps over the rear dropout and holds in place with 4 small bolts + the skewer. I would guess that a basic epoxy metal which is rated for 4000 psi, will easily match/exceed the clamping force of that adapter clamp.