I don't know how you can keep MDM on...at least the non-ZCP MDM. You're leaving so much on the table on exit especially on tigher, slower corners because this car is so heavy. The beauty of this car is how you can rotate the car with power. You can feel the M-diff doing its job in getting the car straight. But you need slip angle and even allow the tires to slide and the inside tire to spin a little. MDM kills it. Even if you do lose the back end, the car WANTS to straighten out. I was in a tank slapper this weekend. After about 3 oscillations, I had it but I went over a curb, upset the car and then spun. Even as I was spinning, you can tell the car wants to straighten out. Check out the video below...see how the rear end doesn't whip around...
I was in some of your shoes a couple of months ago. Don't want to defeat DSC because you're not confident about catching oversteer. I dialed it back and started to force the car to oversteer on slow, safe (no wall) corners with a stab of the throttle and then catch it. You start to get in a rhythm and get that feel. You also gain confidence. As you do that, build a little speed.
I think drifting is an EXCELLENT way to gain confidence in car control. I did one drifting practice and I learned a LOT!
I do keep MDM on for the first session. I think it helps me to knock off the rust quicker by punishing me for not being smooth...rather than spinning the car.
Here's a video of me at the drift practice I went to...