I find the ZZIII to be a slightly refined version of the ZZ-S. It's not as tail-happy as the "S", but unlike the ZZ-S, it can't get a racing modification. But for 1380 lbs, and 276 hp, the ZZIII is a giant killer. I've set laps about 1.5 seconds behind the best All-Stars at Red Rock Valley with it!
Try it stock, then tune it a little at a time.