Im assuming this is the 2 into 1 pipe from what you said, and not the twin pipes.
Sell the fucking pipe, its not jetting, it's how the pipe is made. Its only strong in the midrange, its not a low-mid pipe, and it has no top end pipe either. to make the hesitation go away, you will need more compression, more timing, and your gonna need to drop the exhaust port, and raise the transfers. Even then, it wont carry you like a set of pro circuits, fmf low-mids, or pt mids will. This pipe gives you a handicap, and doesn't give you anything extra over any other low-mid pipe on the market. It's a garbage pipe that wastes everyones time it comes into contact with.