If you are going to check out the converter, I would bring the trans back to Chris and have him take some weight of the governor to increase the shift RPM.
This is my opinion: What I found out with lock up converters after a certain range they begin to hamper you. I went with a non-lock up and the car ran better.
You put more power into the car you will have to address the converter. The HP level you are at now, you might be blowing through the converter. You might have to send it back and have it tighened up.
What were your ETs?
Billy T.
gnxtc2@aol.com