I think it's hard to say whether the difference between the two candle pruning techniques is responsible for the difference in observed vigor after decandling -- or whether it's due to other factors (like the weather, or the amount of fertilizer residue built up in the soil, or the amount of strength built/sapped by compounding the previous years of decandling practices, &c).
Last year I used the three stage method on my 20+ JBPs. This year I used the "all at once" method. However, last year my trees responded somewhat restrainedly, whereas this year they have been very very vigorous. I kind of think this difference between the two years' results (and between my results and yours) is more likely due to factors outside of our control or understanding instead of the rational methods we apply!
Does anyone else have experience with directly comparing the "three stage" with the "all at once" method, especially with trees of the same strength in the same year?