I need a little help getting a SS set up.

Installed per BVM instructions. Throw amount seems correct.
Using aux 3 (10x) slider.

System holds pressure w/ no leaks

Problem is that even at 100 psi it only starts to apply brake
pressure when the slider is at 75% or so. Below this the brakes
are off.
Is this normal (never used the smooth stop before)??

Thanks in advance
W.G. Hunter