What bin and mask are you using?

Are you keeping the torque converter locked during the 2nd -> 3rd shift? Have you modified the target shift times? I would have to look but I seem to remember that the code will first unlock the TCC before starting the shift unless you have it set to keep the TCC locked during a shift. I think that would feel like shift flare since the rpms would rise before the shift even starts. I have my 4l60e setup to stay locked during the 3rd -> 4th shift and it seems to work fine. I also have it staying locked in 4th with closed throttle up to a certain speed. I do remember it took a few tries to get that to work, I think there may be some poorly described settings in the xdf relating to that, but I'm probably not using the same xdf as you. I am using $E6.