Ravn, good luck on mastering HBP/PE16 !
I don't know if doing them under 8minutes is necessary or not but it seems like a good challenge.
I just passed HBP/PE15 and when I tested PE16 I realised that balance was a big issue for me as well. I will probably follow your path and be stuck on this for a while.
I am still at HS/PE5 due to lack of shoulder mobility and thinking that I will have to wait that my HS catches up with my HBP is... demoralizing ![]()