i was thinking about this today, and i dont think we are taking into account the deload/fatigue wear off of peaking. i was also talking to someone yesterday and came to the realization that with my programming, my hamstrings are, and have been, worked 4 times a week for weeks on end. which will start tapering down here really soon, but i think there is a whole other variable when it comes to these calculators with fatigue.
and while i havent competed yet, from everything ive been told, the deadlift in particular is a very high intensity/amped up lift at a meet. so the energy boost and adrenaline rush is another factor to take into account.