Well with any modding, low end will increase, but not remotely as much as top end power so you will notice the "hesitation" in 2 strokes and really any engine when generating more power. Now that's not to say it can't be mended. Where is your needle at right now? You can tinker with it and richen and lean it out and see if it responds any better. Also while riding, take a small screwdriver and ride it and play with the screw and see how the throttle response is up to 1/4 throttle and you can improve it before the powerband. After that, if you have it tuned in and it's still finicky you might start exploring other things like needle tapers, diameters, and lengths which typically becomes more of a hassle than you probably want to mess with as it can slightly affect the entire circuit.
