I really doubt that the shorter the bow the less accurate. It has to do with the specs of the bow. If you shoot a bow with a brace height of 6", and you shoot a bow with a brace height of 8 3/4", the one with 8 3/4" will be more forgiving. This does not mean more accurate though. I may be wrong on this. You may be better off waiting for a second opinion.
You should go test shoot some of the 33" bows and see how you like them. You may not like them as much as a 40" bow.
And whatever you do, pick the Bowtech!