are you referring to that white stuff that looks like a worm? i have no idea what that is, could it be part of the knife edge wearing off? what is the plate? I don't understand what that is. Is that part of the knife edge?In the first photo, what's going on with that area just to the left of the screw? It looks like part of the plate has broken off? Since yours is a black bridge, you can see the wear on the knife edge fairly easily where it pivots on the bolt.
As far as the angle, one likely possibility is that the original owner had it tuned to a lower tuning than you do. For example, if he had it tuned down 1/2 step to D# standard (very common tuning) and you tuned it to E-standard without adjusting the trem, that will cause the tilt you're seeing.