Igor,
Thank you for your reply. I started flying C/L once again a few years ago; all of my R/C model are electric so it only seemed natural to also make my C/L electric as well, it is just so much easier. At any rate, the weather here was unflyable for the better part of October which made the effect of the temperature change really noticeable; went from summer flying to fall flying in one step. I ended up lowering the RPM by about 150 (on a basis of 8250) and the lap times were closer to what I remembered.
Thank you.