Okay, so the asymmetry is my end, i am sorry for ever doubting unreal, i think i am getting closer to understanding the issue though, basically as the drone gains forward momentum, this takes up all the allowed top speed of the drone, and so when it tries to go down it cant add to its top speed particularly, so if the forwards outstrips the down, then it limits its ability to move down. Which is a complicated problem, but at least i understand it a bit better.
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