Pushrod ?

do not just adjust the rockers
get mid lift rocker adjustment then use an adjustable pushrod
reason
if rocker height is set low then the rocker is angled up more when on the seat
and angled down less at full lift
the rocker ratio is maximum when the rocker axis is perpendicular to the valve
in this case that is when the valve is more open
more ratio give you more lift and less piston clearance
this is with either roller or stock rockers
totally not right as you have higher acceleration of the valve when the cam is trying to go over the top- easier valve float
do it right