Congrats on the new numbers. I had no doubt you'd get there since you really only gained more usable power in the modifications you did.
As for the fastest 1/4 NSX, it's really hard say since the definition of an NSX really get's blurred as you modify it. Adam Saruwatari has a 7 sec NSX, but really it's only an "NSX" in name only. Factor X and a few other guys have broken into the 9's but they are stripped down race cars. When does an NSX no longer become an NSX? Does it need to be street legal? Would forced induction be too much of a modification so a N/A NSX the only true NSX? Or does any modification disqualify? Too many variables for there to even be a relevant answer to that question.