does your car have any cats on it? if so, rotaries tend to destroy the inside of them and then they come apart and clog up inside. i used to drive an NA 86 and it hesitated at that rpm and had no top-end and i thought it was supposed to be that slow. then i happened to be underneath fixing a crack in my exhaust and noticed my cat was plugged. a long chissel and hammer cleaned out the inside of the cat. the car honestly had 40hp more with open cats. then i bought a t2 haha.