I have always found longer axle length to be more of a factor than brace height. The more radical the inclined angle of the string at draw such as short bow long draw length, the more the string is able to oscillate on release. High let off makes this problem even worse because the bow becomes easier to torque. Draw length factors in too because the longer your draw the greater the angle in a given bow. In the example you have given I guarantee you will have an easier time being accurate with the 36" bow especially if your draw length is greater than 28". The 3-D and target shooters from my shop pretty much stick to this type of formula when they buy their equipment. Good luck!