She runs great but the transition from completely off throttle to turning back on ever so slightly you get a pretty good jerk.
My 08 did the same thing. It only did it in 1st and second gear and at low rpm. Close the throttle, open it a crack, nothing for a second or two then it would lurch forward like turning on a switch. I got in the habit of opening the throttle wider than necessary and then closing it down to a crack if that was what I needed. It was annoying. The bike did it from bone stock, brand new. Not even the AFR tuning I did solved the problem completely but I think it helped a little. I calibrated the TPS through my PC5 and I tuned for every TP in the map. The PC5 automatically modulates fueling numbers between adjacent cells to provide a good mixture for TPs and rpms that don't have specific cells in the map. The fueling between 0% and the next cell which is 2% should have been very precise after AFR tuning. I know the fueling for low rpm was superb because I could snap the throttle open at 2000 rpm in 6th gear and the engine accelerated smoothly with no shuddering. I don't know why low throttle at low rpm couldn't be addressed as effectively. That's the safest and easiest part of the map to do tuning runs on.
My next step would be to clean injectors and replace the pre-filter in the fuel pump. From what I understand, there's a filter inside the fuel pump that is not removable. I saw pics of it looking like it was falling apart in cut open ZX-14 fuel pumps. If you want to change that one, you have to replace the whole fuel pump. However, that might not solve the problem. Like I said, my 08 did this from day one. The problem never got worse as I would expect it to if it were caused by some clog in the fuel system.
'08 MIDNIGHT SAPPHIRE BLUE Now Deceased