I've been staying at 5X12sec for planche leans for some time now because I feel like I can always go a bit further. I've gone up to 18sec on a couple of occasions, but I find that I'm hanging back on the lean in order to last the 18sec.
I've been thinking about increasing the number of sets I perform to allow for an increased TUT while still being able to focus on form with the short holds. I was considering the same thing for ABH as well. This would also allow me to load/deload on the 4 Week Cycle instead of keeping a static volume for 3 weeks and then only changing it during the 50% deload. Any thoughts?