Nag1 shifts to neutral at WOT

I'm not sure if the traction control not being off (i forgot to turn off) anyway i changed a little on the tcm side also have some other questions. Anywho i did a left turn then a pull it down shifted to either 1st or 2nd (laptop died while logging) then just went into what felt like neutral. I had to stop and restart the car to drive it again. After that i did another pull with tc off and no issue however i dod not break traction that 2nd time like i did the 1st time. Another question is can you unlock the 5th gear on the autostick function? I know with diablo you can but i can not find a way with hp. Sorry for all the questions I'm a noob.