Theoretically, canted fork heads is good design. It brings two changes to flatband slingshot. First, as you know, there is advanced shooting skill named 'flip style'. The canted fork just make the 'flip style' built with slingshot. Secondly, I aim through the gap of forks, canted fork give bigger vision to look target for aiming. That's my thought.

Grip the slingshot canted toward your face. Flipping the slingshot as the shot is released is not too hard to use. The heaver bands make it easier because of the harder pull and when the shot is released the slingshot will naturally flip with the release