My second ATR had a different tyre on each corner. It pulled left, then right, it was pretty dangerous to drive I'd say. I had to drive it to Brum and back and I distinctly remember it being a hellish journey, as it was raining and the car simply didn't feel planted or that safe. Shortly after I fitted RE002's all round and it transformed the car (as I knew it would).
I know I in particular harp on about running decent tyres, but it really does make a huge difference. I can only jump to conclusions but I guess the OP had mismatching tyres on, it was raining, he was tired, the car started understeering and perhaps he lifted off the throttle. In an EP3 that can sometimes be enough to lose traction across all 4 wheels especially in the rain and with poor tyres.
I know I in particular harp on about running decent tyres, but it really does make a huge difference. I can only jump to conclusions but I guess the OP had mismatching tyres on, it was raining, he was tired, the car started understeering and perhaps he lifted off the throttle. In an EP3 that can sometimes be enough to lose traction across all 4 wheels especially in the rain and with poor tyres.