You showed images of a mount with "40 arc seconds PE." Assuming you ran a valid test it only demonstrates that PEC improves guiding if your mount has 40" PE. I fully expect it would. That doesn't begin to address whether PEC improves guiding on an AP mount with less than +/- 3" P-P smooth native PE.
Regarding guide logs... here's a copy of the email I just sent you - with guide logs from both mounts on Sep. 4 attached. I can't imagine they'll be helpful - it's just one of the times I've enabled PEM and noticed no difference. I can also provide you PEMPro logs from that same evening if such a thing exists. I plan to do a proper and much longer test when the weather cooperates - possibly tonight.
There was a lot going on this particular evening ... creating new PEC curves in PEMPro, running guiding assistant, testing various PHD2 settings, testing PEM on/off, etc.
These logs will be very difficult to draw any conclusions from since I had zero intention of making them clear and intelligible. What I can tell you is:
PEM was enabled near the end of the night on one of the two mounts. I believe it was enabled on the file that ends in 201308 but I don't remember for sure. Total RMS stayed right around Total RMS for the other mount which had PEM disabled. I also didn't notice a change from when PEM was off vs. on.
I will try and do a proper test tonight. If there's improvement, that's what I'll report. I hope there is.