When we did TOC and IMAC stuff - we cured the P problems pretty easily
Low weight and enough power to accelerate straight up works
The problem is much of the off the rack stuff just won't do that
Ditto on pattern stuff
Lowering weight and increasing power cures just about anything
The full scale guys always knew this but doing it was quite another thing
NONE of th warbirds could do it -
The Red Bull contestants really work at it
Those things are almost as good as a flat 3D foamie
My last EDGE- a H9 with clipped wings , end plates and a ZDZ80 piped would accelerate vertically from a dead stop hover