i've never asked for a form check of my hspu.
much time has passed since I started the handstand push up.
bad hs and of course bad form was one of the first stupid thing i did, i focused on free hs before pass to free handstand push up movements.
Actually i don't train the vertical press with them, i find hspu on pbars easy since i got 5x5 reps previously and actually i'm working only on free balance hspu on rings.