Interesting, so the props don't matter, I expected that but good to know for sure.
The throttle might be doing the same thing here. I don't move the stick slowly at take off because it threatened to flip over in the beginning. I always throw it at full, ever since it changed.
I m going to try a slower throttle as well maybe it is just lag and nothing more.
It definitely changed behaviour at some point and that's what's bothering me. Not a big deal because it flies great but with toys like this, capable of causing nasty injuries and damage when not handled with common sense (or when not programmed right), I just want to rule out possible causes for future disasters. At least as much as I can. Who knows, maybe the throttle issue is a preview to a much bigger issue in the future, don't think so but you can't be sure enough.