Maybe i misunderstood what you wrote;
1) You had it tuned at Chruch, showed gains over the pulls on the same dyno moments earlier with the SZ tune on it.
2) You went to SZ, ran it on their dyno, showed ~same numbers.
3) You re-loaded the SZ tune whilst still on the SZ dyno and pulled it again.
4) There was no apparent difference between the two tunes on the SZ dyno.
If all of the above is correct, what i'm suggesting, is that because the car already has the spark advance from the Church tune, then reloading the SZ tune (which didn't touch the advance) would not load any advance change because it doesn't contain spark advance in the SZ tune.
That is what i believe the tune at Chruch was to show (gains possible with Shockwave & advance)
So i'm saying that it looks like the reason you showed no change between the tunes when going back to the SZ tune, is because it still has the spark advance set from the Church tune.
Make sense?
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