Sometimes there is a very fine adjustment of the throttle plate that covers or uncovers ports which direct air to different places. So the fine adjustment might need another look. There should be complete instructions on it. Off throttle response is also related to the accelerator pump.

Tom W

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.