I have gotten away from the JET cross method but I still use the extended pull times on the crosses. one reason I don't use the JET on the crosses is because I start my crosses with a starting knot and not the way the they do it. So, I don't need to up the tension on the 1st 3 crosses to compensate for tension loss when tying off the knot. That's the main thing. On the last 2 crosses, I do up the tension to compensate for the last knot, though.
as far as the mains, my racquets have 16 mains. Going from the center out, you have 8 mains on each. Using the JET method, I tension the inner 4 mains at my reference tension. The next 2 main, I drop 4 pounds. When cutting out strings, have you ever noticed that mains 5&6 are usually tighter than the others? I guess that why the JET method drops the tension on 5&6. Then, bring the tension back up to your reference and skip to main 8. tension it. then, up the tension 4 more pounds and finally string up main 7. Tie off... it's very simple. the lower 5&6 make the mains feel more even. and the 7-8 swap works well for keep tensions even all the way out,too.... while minimizing tension from the knots.
It doesn't work well on all racquets, though. sometimes, it's just too hard to accomplish due to stringing patterns, hole sizes, etc.