Have you tried tighter front shocks? I know this goes against the status quo (so I won’t debate it.)

stagger your front tires my buddy used to do this to slow his RT it worked well.

Reviewing some older posts tonight and remembered my old chevelle issue. Ened up retarding cam 4*. Ya I know it will slow it and your looking for et on other thread but it worked for me.Also add wheely bars to keep front tire in beam longer.