||Honestly, most of the Quaife praise here is in comparison to a 25-30 year old stock VLSD, and I'm not aware of a huge drift following on tt.net beyond some occasional farting around.
Mud patches and standing water are not something I would expect to encounter on a closed course track day or auto-x event. And if I'm lifting a rear wheel on the Z, something has gone terribly wrong.
It sounds like you have a lot of practical experience with the different options, so hopefully you find what your looking for. Good luck.