[Signman]

Great thread!
The reasoning for not using solid engine mounts to avoid this problem may be a good bandaid for the real problem: Chassis Flex.

When building my cars spent a lot of time making the floor pan stiff welding all seams top and bottom with the car level then locating roll bar mounts with chassis stiffness the intent within the rules. A lot of hard dirty work but makes stock chassis cars stiff and lets the suspension work.
Rubber body mounts on A and G bodies replaced with solid steel or aluminum helps a lot.
Even though this is a 13 second car doesn't mean there is no flex. Get rid of it and pick up some ET.

Good Luck!