You're not real clear with the problem at hand. You state that the trans almost locks up on the stands on the 2-3 shift, then you state it is lazy on the track. It's not uncommon to get overlap on the stands. What does it do on the track, run away on the 2-3 or overlap on the 2-3. What's lazy mean, it feels like it is slipping or not very quick to respond to the shifter movement? Watch the tach, if it jumps up on the 2-3 that's runaway, if the tach immediately drops and the car noses down on the shift that's overlap. Over lap means the front band hasn't come fully off before the front clutch has come on. Runaway means the band came off before the front clutch came on with sufficient capacity to pull the motor down. Any good valve body (A & A, Turbo Action, etc) out of the box installed in a properly built trans will not be off the mark, the rest is all timing. The number of front clutch springs vs. front band operating ratio and the front band release spring/s makes up the timing. Just the correct combination of parts. Believe it or not, go to the old Direct Connection manual, pick out the front clutch spring combination for your engine size, and match to the front servo release spring stack. You won't be disappointed. Remember, those packages were done by the engineers with only one motivation - make the Mopars as fast as possible.