NT555Rs are a ton better than regular street tires when heated up at the track. But they need a nice long burnout to get them softened up.
Yes, 18" wheels with MTs would work a lot better, but that requires a second set of wheels/tires and you have to take the time to change out your wheels everytime you go to the track.
The NT555Rs are all we've got for a daily driver drag radial. We're still waiting for the 305/35/20 MTs to come out (supposed to be any day now). But they will not make a good daily driver tire, but it will give us another 20" drag radials option along with the 315 NT05Rs.