One caution about going to the very high letoffs is they make it very easy to torque the bow. Pick up your old bow and draw it to anchor, hold anchor then, by flexing your wrist, try to twist the handle side to side. By that, I mean like you' re facing a wall and trying to make the stabilizer point at the walls on either side. See how far you can actually move it. Then go to the shop and do the same thing with a high letoff bow with a reflexed riser.

But be careful to not twist that new one so far that the string pops out of the tracks on the cam(s).

That should give you a good feeling for how much better your form will have to be to shoot those high letoff bows well.