I was using the stock brake pads (upgraded fluid of course) that came with the Stoptech big brake kit (front and rear), and was actually quite happy with them. They were consistent, bit well, and didn't have any issues with heat/etc.
So what are the pads that come with the Stoptech kit comparable to? Or do you just use the OEM Acura pads in the kit? I'm sorry I don't have experience with them. I too use NT01's but I run the stock system with ABS disabled, like illwillem, and I use Hawk HT10 front and Hawk Blue in the rear. I had tried Carbotech AX6's all around and was "getting away" with that setup but may have reached the capability of that pad. End of season last year I did an event at a track I know well now and had vibration develop dramatically at the rear by the end of the second day. Beginning of this year I changed rear pads and rotors with new AX6's and did an event at my home track with cold ambient temps- brakes felt fine. Then went to an event at a track I know well and changed front pads and rotors with new AX6's, ran 2 days and had light vibration at the front - the weird thing here is that I was bedding them in on the way to the track and on the 4th bedding procedure began to feel some light vibration. Then in late April went to a new track, it was and still is confusing to me because the vibration progressively worsened at the front, and I was at the same time running my 235/17 275/18 NT01's for the first time, coupled with the fact that it was a new track for me so I was depending on the brakes more initially as I was learning the track. I really couldn't figure out if I got a bad batch of pads, rotors, or I was simply overheating the AX6's due to the above mentioned changes in car and track? Were the AX6's simply not durable enough to stand up to the heat generated from an NSX on 235/275 NT01's? I went with a setup that I liked back in the day on my S2000 (HT10 front/ Blue rear) and also made some brake deflectors for the fronts per DDoziers recommendation - this brake setup worked perfectly at the last event.
Keep in mind when you make a change from a street tire to an NT01, you SHOULD be faster, but it may take some sessions or events to start utilizing the extra grip at hand....or maybe not at all - I think that depends on the type of driver you are. Even if you are not yet braking later or harder on them, you might still be exiting the corner faster as you can be picking up the throttle earlier from apex to exit, so you may find yourself arriving at the next corner faster than when you were on streets, and you might be standing on the brake pedal harder at this point. It starts to get complicated from here as some corners you might find yourself using LESS brake pedal effort to decelerate the car appropriately for turn-in as there is more grip available, but then other corners, like the first corner after a long straight you could be arriving at 5-10mph faster possibly because you have exited the last corner that much faster and now your using more brake pedal than on streets and a higher load on the actual pad and rotor in the same amount of time.
I don' think anyone that has moved up to dedicated track pad has ever regretted the increase in braking power and ability to withstand higher amounts of heat for a longer period of time (like illwillem's summer time setup). I remember 8 years ago I took my S2000 to my home track for the first time, it was totally stock on street tires and I had read on s2ki alot of people saying "you'll be fine on OEM pads, maybe buy new ones for the front" so thats what I did, along with a high temp fluid. I completely erased a set of OEM pads in 6 sessions and drove home on the concrete backing plates! That was a track where you would brake from 125mph-55mph, 95mph-40, and finally 85mph-40mph and out onto a long straight to cool things down a bit. I realized that I was driving beyond what the OEM pads could handle and promptly switched to HT10/Blue combo and it felt like I had a $10,000 brake package on the car in comparison when I returned to that track.