Are you running phoenixminer as administrator?
Did you recently remove/add/swap cards?

As for overclocks, I'm using -502 core / +1150 memory, @ 65% PL, getting ~95-97mhash on a Suprim X.
Memory temps are at 92-94C, no thermalpad mod yet.

I was having trouble with 'high' temps at first, but this was because I forgot that I had set -tt 65 in Phoenixminer.
With core temp at sub 50C, this meant Phoenixminer would cut fan speed to ~850RPM.

I removed -tt and set fan speed to 60% in afterburner (~2000RPM, but not too noisy) and got memory temperatures to 92-94C.

So if you're stumped with hot memory clocks, make sure you didn't forget -tt on in phoenixminer (or just set it much lower than before, so that the fans speed up).