I know Jenz was struggling at the track, here are a few vids of my car and a buddies car making a pass. Had these in my journal, thought it might help here. I would have gone faster but my O2 sensors were wired all assed up at the time (I didn't know yet). I haven't seen very many Z's get deeper into the 13's stock like they do at other tracks. Idk if it's elevation, heat, track prep, idk. Even a lot of cars that run 12's were averaging mid 13 passes. The GTR's could care less and were snapping off 11.2 -11.3 passes.
Anyways, I launched at about 3500-4000 rpm and seemed to work well. My car had LTH's, HFC, CBE, pulley's, CAI, oil cooler, no tune, and stock tires, didn't adjust pressure, just pulled up and ran it. These were last year on 28 April.
Here is my buddies Z. He has lowering springs, Berk HFC's, Berk CBE, AEM CAI, no tune at the time.