back again with a niggling transmission issue with my 74 chrysler that i did a fluid change on after it assploded its trans cooler

I think the transmissions possibly overcooling now? and with the Lucas Trans Fix i added thats like 100+ weight fluid im thinking its really made the oil so much thicker. It takes ages for it to upshift from cold, ill have to idle the car for at least five minutes if i want to see a 1-2 upshift when i pull out into the road. Thats not ideal but its manageable, just warm it up for longer. My real issue is that even 10 minutes into the drive the 2-3 shift wont happen unless i full throttle it. The shifting quality itself is fine, it just wont make that upshift at all unless i make it. Sometimes when its 'stuck' in second i can pull the shifter down into second and back up into D and itll then shift into third. Downshifts are still working fine, i can feel it go back into first no problem when i slow to a stop.

Looking into my manual it seems like R (the Governor) and M (the 2-3 shift valve) are at fault here since it doesn't feel like the clutches are slipping. Also i found out what im doing when i manually shift from second to third under load, its actually routing the fluid again in a sense. What im trying to figure out anyway is if i can adjust the kickdown cable which sounds counter intuitive but it might adjust the internal pressure to account for the heavier oil provided by the lucas trans fix, otherwise i might be forced to take the pan off again and physically clean out the valve bodies

I think i should just 3spd manual swap it lol, auto trans are aids when they start faultering