I can't effectively trailbrake with the DFGT very much or I spin. I've tried both extremes in bias and lower front brake bias seemed a bit better.
However I have tried just about all of my real life oval setups to the best of my memory and I am definitely convinced it's me just not seeing it, I went back to the iracing setup with minor tweaks
As for the wall, you just need to go for it (in tests)and most likely you'll notice wall effect (that's what I call it, it's very similar to ground effect on aircraft) at least that's what it feels like to me. If it's a four wheel drift that's common, but I just get on the gas too early and I get understeer
Also, I still haven't had the time to join a race but when you are searching for a race is there a way to filter a list, I've been looking at what races pop up in the join a race menu and I can't seem to find a legends race