Does anybody have any good PID settings for a stock frame ArduCopter with 924kv Hacker Style motors perhaps? Or can anybody please tell me a good way to start tuning these settings and what to look out for?  All the documentation on the internet says to start with the RATE ROLL P value, but how much do I add/subtract at a time? Also when I go into ALTHOLD mode my ArduCopter tends to stay level fo…