TCI 727 super street leaker NIGHTMARE!

Just something to try......one way to get the fluid RIGHT on the money. Fill it until the trans drops INSTANTLY into drive from neutral. I mean RIGHT NOW. As soon as it'll do that, it's full. I don't give a rat's butt what the dipstick says. Also, you are checking fluid level in neutral, right? Because chacking it in park will result in an overfill condition.