The problem with a bow with that short of a brace height is that it becomes very unstable and takes a long time to settle in the hand when you pulol to full draw.

The bows pivot point is at the grip. The string is only 3 inches rear of the grip and the limbs are attached 9 inches in front of the grip.

Basically the more reflexed the riser the more the bow wants to turn around backwards as you pull the string.