Its not black & white on decel since engine changes have moved vaccum around, DEFCO or cell boundaries were changed via a tune, etc

There are really two conditions, certain cells like 21 are large lift of gas pedal but other cells are smaller lift but in both cases if not set to a conditional math in Excel would be added as if they were part of true LTFT averages.

Only setting conditions in the math in Excel can you find true values but in the end, again of trims are within -/+ 5% of STFT then PCM is ignoring LTFTs so you can chase a ghost that is not there.
As to WOT there is no performance difference if AFR is 12.4 or 12.6 so as long as there is no ping and timing is close to around 28 degrees for a NA engine then tweaking tune any more does not buy you anything.

Lastly cars are not driven like being on some chassis dyno so it must be considered that simple movement of gas pedal can skew trim averages but mean nothing to overall performace.