Stop in for a cup of coffee

Its been a while so maybe I'm missing something. What's does either have to do with line pressure?
Trans failed. Replaced with new rebuild. Used original cheetah valvebody. It was new. Failed trans less then 400 miles on it. Bought new PTC Converter. Got it put back together seemed ok. Shifted fine
Now next day soft shifts and no movement after sitting a little while. Put in neutral for a minute trans will move. But still not as strong a 1 2 shift. Valve body was disassembled to clean.