Trans shift points?

I'm running the Lokar cable with my 408/727. First, I made sure that there was no slack in the cable and that the travel in the carb lever matched the travel in the tranny throttle lever so that at idle the tranny lever was full forward and at WOT the tranny lever was all the way back. I then made adjustments with the adjuster nuts up at the carb end of the Lokar cable, lengthening the cable sheath 1 thread ( 1 revolution of the nuts) at a time until the shifts dragged out to where I wanted them. I put dots on the 2 adjuster nuts with a paint pen so I could tell their position when adjusting. It took me 6 full turns to get it 'just right', but only 1 turn at a time then road testing.

I also put a light return spring on the tranny throttle lever pulling it forward. That seemed to help as well.