I'd make sure the high needle is 2 turns out and only tune the low needle. The high basically needs to be all the way out since it's not cable of being too rich. You tune the low needle for a good transition and the high end follows along. It runs fine when tuning like this. It won't overheat, I have flown in high 90's and same humidity level, never a dead stick. I'd guess your engine is fine if it runs well and has good compression. The tick sound is in every DA 50, not a biggy.