Steve T - is the car you are inquiring about supercharged? Does it have HRE wheels? If so, private me.....if it is the car I am thinking of, I know it fairly well.
Regarding the clutch issue, it is probably "normal". I have driven another NSXer's NSX immediately after he had a clutch installed. It shuddered just a tad as you are leaving from a stop. To me it was normal but to him it wasn't, because his 911 didn't do it. Well, you really can't compare the two cars. Mine shudders a bit but clamps just fine - even after two years of daily supercharged driving. The clutch is currently transmitting 435 FWHP to the tranny, so I'm not even the least bit concerned about a little take-off shudder.
When installing an NSX clutch something that all Acura techs must do to a factory clutch is a step called "initializing" the clutch. There are three buttoms on the clutch assembly at 120° apart from each other. The service manual clearly outlines this step. Another step that is not alwayss done, but I think it a good idea is after the tranny is bolted up, loosen the two engine mounts and the two tranny mounts. With the car up in the air the tech "rocks" the engine-tranny assembly with his hands so that everything is resting in the mounts without binding. Then tighten the four mounts. It is not absolutely necessary, but it may help.
Having said all that, it the clutch is shuddering as you take off from a dead stop, it will probably do it until it is replaced again. As it was explained to me, once the clutch "learns" the wear surface and wear pattern of the friction material, it is there to stay.