Remember older NTM iterations (not mentioning the period before NTM), when Skippy wasn't that easy to drive. It was very recently, when Skip finally got civilized in iRacing (along with some other cars, with NTMv5 I think?). Give ISI guys time to finish their work on major aspects of their tyre model. Then, in my opinion, it will be fair to compare.
Don't get me wrong its very, very close, sound and cockpit are very good. I was pleasantly surprised to see it here. It was probably the first car I downloaded.The AI is soo good too. Thats one thing RFactor has and iRacing never will. Racing with real people is great, but sometimes its nice to race the AI too, especailly when you can dial them back a bit and actually win a race
You can tame the skippy very very very much simply lowering the rear ride height and softening a click or two the rear sway bar. If the car turn too much understeery, revert a bit the setup.
Can't say much about FFB, because I use a TSW2 wheel which doesn't have any FFB at all, real Old school stuff !