Diesel Bombers - Torque Convertor lock and idle

Ok guys excuse me for my ignorance here and try to work with me. I am not familiar with auto trans.
Here is the story- This weekend I put the 4ks into my buddies truck. It had 3ks so all i did was put the small spring in. Got that done and the idle needed let down a little. We proceeded to do that and we couldnt let the idle down do to the cruise control cable is holding it from going down any further. Well we went ahead and just rolled with the idle being a little high. Went and drove the truck and now anytime you get out of the throttle in overdrive the convertor unlocks. It didnt do this until we put the 4ks in.

While we are on the subject, this trans has never felt right. It has a triple disk convertor, shift kit, and fresh rebuild. If you just leave the truck in drive it shifts ok and fairly quick. However if you shift the truck manually about 2100-2200 while just moderatly on it, the truck will go straight into gear and in a nice firm manner. Is there anyway to get the truck to shift like this when you just leave it in drive? Is there something out of wack in adjustment? Like i said guys forgive me for my ignorance.