I took the dish section off the mount, and instead of stringing it, I put it on the (pretty flat) garage floor for measuring. I then gently bent it where the rim wasn't flat
Repeat until well done...
Reinstalled the dish, tightening the bolts just enough to stably secure te dish to its mount.
BINGO! Finding FTA satellites is almost as easy as the DSS birds now.
Currently on IA5 to keep the inlaws happy until I get the motor installed.
Later, once its all working, I'll gently tweak the dish to grab as much signal as possible. Probably I'll do that on SatMex 5, which is a fringe bird for me with about 39-41 dBw EIRP in my location (extrapolated map)
NO WONDER I was chasing my tail last weekend!