George, I have the same problem. It became better after I got the advice to keep the front wheels straight while braking hard but not good enough to match the lap times of the aliens. I think the fast guys are more capable in "throwing the rear into the turn" by oversteering and countersteering so they can go faster on the throttle in turns.
Everytime I try to do this, I end up in a spin. Of course it's hard to use the right braking power to do that with pedals that have no loadcel (I use a G27). But alien Enzo is even on my rig always a lot faster. So it's mostly my driving skills. Recently (thanks to @Craig Dunkley) I discovered the Ginetta G55 with which throwing into the turn is a lot easier. So I'm now planning to do a lot of practicing with the G55 to improve on that aspect of racing. And than trying that with more difficult cars.
