Real quick before I head back out to work....
there is a balance to be achieved in a Hill bow for optimal performance....a short riser allows for longer working limbs...allowing for a shorter bow overall, which gives more limb bend at full draw, which gives more speed, which makes a string follow bow remain fast. It also lightens the total bow physical weight, making it less shocky....
basically, and there are lots of variables which I won't go in to, but based on the old time Hillstyle bowyers, like Schulz.....limb bend at full draw reveals alot about the bow performance.
I.E.....optimal bow for a 27" real draw, medium sized hands..... 66" long, 12" riser, narrow limbs, 3 wood lams, all one limb wood material, no tip overlays, colored glass, string follow.
Why? for a 27" real draw..... 66" minus 12" static handle results in 54" of limb length bending in a nice, tight curve. a 68" bow with 16" handle results in 52" of limb length bending in a shallower curve, which means less limb recoil speed trying to move more mass weight which equals less efficiency. A 68" bow with a 12" riser means more limb length for power, but still a shallow full draw curve so the limbs are trying to move more mass with less speed of recoil.
like I said, lots of variables and ways to tweak the bow to fit the shooter....to me, that's what Custom means. not fancy veneers. Although I will be the first to admit...a Redman or the new One Shot by Craig are fetchin bows to my eye.