Mine is the same way. My issue was that on WOT the 1-2 shift felt like it was slipping. It would hit 6200 rpm in first, shift to second and drop to around 5700 rpm, it would maintain that rpm for a little under 1 second (while still accelerating), and then the rpms would climb for the second half of the gear. It only happened on the 1-2 shift on WOT.
We did a bunch of datalogging and he had the shift pressure maxed out and it still did it. Eventually we got it to the point of no longer feeling like it was slipping. But it has a slight shudder on the WOT shift now.
got tired of going back and forth and settled for it. Still in the back of my mind I'm considering calling Livernois and asking about their tunes. If they have a money back guarantee that their tune would shift properly I would probably buy one. But I haven't called them yet.