I think I know what to do :
"The linkage rod going to the block pivot should be set so the venturi is all the way open when the accelerator is at the floor while still allowing the venturi to completely closed when the pedal is up."
I thought I read that this rod also adjusts gear changing timing? Perhaps I misread that.
The car had no problem with warm starting until I "fixed it" (csv was disconnected, linkages way out, wsd not closing) and now it is nearly impossible to start when warm. I renewed the wiring harness so I'm not sure if I put this back in incorrectly. Easy to start from cold.