Keep PoweRec enabled - better safe than sorry.
I think most people burn with PoweRec enabled, I know I do.
As I suggested above, try performing a FE/TE Q-Check scan on blank MCC 003 media before burning it, then burn it (or use some you already burned on the new burner) and perform PI/PO scans and post the results. I suggest you do a Sum1 scan and a Burst scan. Set Good or Middle Accuracy in Preferences and adjust the scale of the graph so we can see what's going on.
Here's some examples of what I'm talking about. First a FE/TE scan, then a Burst scan and finally a Sum1 scan. The PIF numbers in the Sum1 are a little too high but not alarmingly so.