Don't let the 44 stray your thoughts but concentrate on the % sign. Now take the fact that there is a % change in rpm on the gear change and accept the fact that shift RPM drops will be a % of the shift rpm. That means it will always change which is part of the reason you don't see huge changes in shift RPM when you ring the motor.Can you explain how this 44% came about, please? Its a 1.69 1st gear in case you didnt read that. Like I said before I don't know it all specially when it come to trans, converter & gear multiplication. I don't have to tell the world they are here reading already. I dont appreciate the "F" word.
You will always fall back to stall speed , in your case 7400 , get used to it and get the car to make it up before the shift or after the shift.
Go find a way to make more power because 173 and the ET's you posted seem to be correct. I would see a problem if you ran 8.0's and posted 180 mph.