I figured out part of the problem, but it gets worse:
apply Roughen Edges to Text, do not move that layer, pre-compose, apply move to pre-comp = no boiling edges
But I need to do a credit roll, so how can I accomplish this if my initial Text can’t be moved?
I can create an initial comp that’s 1920×20000 pixels and scroll that…. but then I need to severely alter AE’s memory cache so it can “allocate an image buffer” and render times per frame are about 30x higher than normal.
in an ideal world if the credits were LOCKED I would just render out a huge TGA file, import that, and scroll it. Easy. But credits are always changing till the last possible momement.