I've just spent an extended lunch-break playing around (it's OK I started work early today) as I wanted to explore the title more outside of the career progression, and also step outside my normal driving style (as I had a suspicion that I may not have been seeing the full picture as a result).
So what did I find, interesting stuff (if your me) is what I found.
First a bit about my driving style, it's neat, as neat as I can make it, measured input, as smooth as I can get them. And that works really, really well for GT 7, and GT 7 stands up as closer to reality in that regard than GTS. It even stands up as you play around on that edge of slip, allowing small corrects using little more than a twist of the wrist to be used.
All lovely and nice, but what I hadn't done was hoon the living crap out of anything, mainly as it's not my thing at all. So I dropped into the (virtual) seat of a 370Z and took it out for a sideways spin, now I'm no drifter, but I can hold a slide for a second or two at a reasonable angle.
Well actually it turns out that no I can't.
So, humble pie aside for not testing all circumstances in the past, what's causing this. First I disagree with those who are laying the blame at load transfer, if that was the case we would be seeing problems below the limit and when balanced on the limit (and those two areas are pretty accurate and better than GTS), which leaves the tyre curve and model over the limit as the issue. Well not the only issue, as what I also found is that the FFB has a massive amount of drag when trying to countersteer during larger angles, which can't be removed even if you set the FFB to 1/1.
I was even contemplating a video on it, but then I remembered, I've seen this somewhere before, and I found it (and those members saying GT7 and iRacing are totally different may wish to reconsider once they watch it - GT 7 isn;t quite as bad, as it's possible to play around more on the limit, but once your over that, well not much different at all).
The long and the short of it is.
Up to and at the limit = GT 7 Good Doggo
Over the limit by any more = GT 7 Bad Dog