carey, if you think it is hard to roll a car, watch 'Crashin'. It's 4 parts, 2h in summary, of race crashes. It is easy as hell to roll.
Grip understeer will be fixed in upcoming and maybe in later patches, but overall lack of grip feeling is case of mega stiff setups + perception of PC screen.
I've seen latest rain race video of Tristan, I thought 'is it cruising or what?' Looking at G-meter said it was not cruising, nor speedometer... Just after that I jumped in FOX (in LFS) and, wow, it was amazingly FAST, I was scaried!
That's human perception, it's lie and can change by 180* in 5 minutes.
Go test some soft setups, look at speeds your are trying to take corner at, than run imagination and think 'would I take this corner at 140km/h in real life?'
If yes, write about it here before you try.