Hover near 75% only assumes a near linear curve (huh?).
IOW, hovering at 50% stick, in order to get from 6 degrees (starting hover pitch for the R30) to 9 degrees (just a guess) is a 3 degree change. 75% stick would be half the change or 7.5 degrees.
Now if 0 degrees is at 50% stick, you would have 9 degrees of change. Half of the change (4.5 degrees) would land on 75% stick (still assuming linear curves and servo movements). So, without inducing a curve (non-linear), hover pitch would be well past 75% stick.
a Raptor 30 that takes 6* to hover has one of two things happening, either it has a head speed of 900 RPM or a brick tied to the skids. using a liniear pitch curve with low stick -9 and 0 at center and +9 on top a R30 with 1450 RPM head speed will hover at + and - 3* VERY slightly above and below 50% stick.
kc