Something else I can add.......

I have seen it before where the best tune for power on the dyno didn’t end up being the fastest way down the track.

I think Greg made some fairly sizable changes to his tune on the dyno.

If the numbers from the track don't get to where he thinks they should be, it might be worth trying to move the tune up in the direction of where it used to be....... and see if there are any positive signs on the time slip from that.