Nothing I've tried has had any impact on the horizontal fold.
It does appear the flyback is a replacement so that could be an issue. While tracing out the wiring I believe I solved the mystery of the clipped terminals mentined at the start of this project.
The Riders service info mentions two variations on grounding the HV doorknob cap. Mine is currently in the configuration that does not require several components. Those clipped leads are in the general area where I would expect them to go if needed.
The service info also mentions two flybacks used during the production run. One with a laminated core and one ceramic. It appears I have the ceramic (powdered iron) type.
The schematic shows a 470K and a 0.0022 in parallel here while I have two 470K and a 0.001. Seems the damping effect would be the same but not harm in try what's shown.