Not that I am a perfect driver by any means, but if I am remembering correctly, was that the Scuderia last night? If so, in addition to what Akira said, and I so apologize if this is too obvious, but the high HP cars specifically need a gentle handle on the throttle, especially when turning or starting from a stop. Otherwise you just spin and spin. There is also such thing as lowering the car too much and that can make it really jumpy/twichy.
I replaced my daughter's blinding pink princess LFA race car (because girls can be racer car drivers too) with a Scuderia right after last night. I wanted to change the suspension and in perfect 3 year old form she doesn't want to put suspension on.
As for class D, I am not sure what to tell you. My first car was one of those "what do I have in the garage that fits the spec" and I just couldn't handle a silent car with no gears. No down shift or engine noise tell give you me an estimate of how fast I was going meant I was slamming in to walls (and people, sorry!!) far too much. Then I bought the NSX mainly because I didn't have one yet. It is suprisingly easy to handle. I do think the lotus will have the edge, however. I believe it can get much lighter, and isn't as long. Of course, last night, it was a pair of Integras, or was it Civics?
) and always looking for some good clean casual racing. 
