I think you should just re run the program until it stops working. If you made deep runs into TM you should have a decent feel for how much stress you've accumulated vs how much stress you've been able to recover from. I don't think it's ever really suggested (here anyway) to fail a set because of the amount of stress that can cause, especially as the weight on the bar gets heavier.
I would think you would end your NLP at a heavier weight than you did thr first time. You should be able to make bigger jumps than normal at first but then they will start to taper. Throw in your light squat day when squatting heavy 3 days a week is too much then run that until you have to add your backoff sets on Friday. The end of the NLP seems like it's pretty damn close to HLM so if you just run the program again it should be a pretty smooth transition into HLM. I'm just some guy though so caveat emptor.