Wow, then I guess NiMh's have really gone downhill in performance since I last used them. Of course, the only ones I ever used were the more expensive matched packs(near to what sponsored racers got, as close as I could get my hands on), & my own experience with them in the transition to LiPo was much smoother. I also have had a Novak Sentry for a few years(which can monitor actual battery voltage during a run & then play it back later on a PC), & my NiMh's actually began runs with MORE voltage than my Lipos, but the difference I saw was that the LiPo didn't drop off as much by the end of a run. And on track, I couldn't see ANY noticable difference in top end(& I did test runs with the same car, same ESC & motor, same setup, everything, only changed the battery), data from my Sentry saw NO change in top speed. Not saying you guys didn't feel a big difference, only relaying MY experience(which btw, spans over 2 decades, so I've pretty much seen it all). The only BIG difference is in weight, & that can account for some improvements in acceleration(& sometimes in unbalancing a vehicle, especially when you have that much less weight over the driven wheels)...