I'm no engine pro by any stretch of the imagination, but I do know that down here in Texas the weather does have some effect on engine performance. With these humid times like now, it usually requires a bit more of a richer setting. Just make sure you tune before take off especially on the first flight of the day. Always lean for max RPM then richen up a couple of clicks back or 300 RPM if you're using a tach. I like evos. I only have one which is their .46 and its run perfect for me. I wouldn't worry too much about it, just get it tuned right.

Good luck.