From that description, it sounds like the low end needle is adjusted too lean.
No power from the start, but power on the top end.
Do you get gobs of smoke on low end, or hardly any when you nail it?
What DDM pipe do you have? The mid to high pipe will act that way. Here is a small video of the way the pipe works. In the video you will see it takes off somewhat quickly then hits the sweet spot, at this point if you let off on the gas and hit it again you will pop it right up. See if it is acting like yours in the video?