Finally made it to the track after installing the MSS springs. Lap is on a fully wet track about 10 minutes after it stopped pouring.
Car is on MPS4S* and these tires still performed incredibly even though by design they lose a bit of wet performance over the standard MPS4S.
Front axle grip continues to be fantastic even in the wet as far as I'm concerned and had very minimal oversteer with careful roll on the throttle out of corners.
While it was obviously much slower than on dry, I'm happy to report the MSS HAS performed excellent on this relatively bumpy track. No noticeable difference compared to stock springs and that's a good thing since the stock setup is fantastic.
For reference, here's a lap in the dry from a previous session: