Sooo, on that note lol, I'll contribute something I guess...
I feel that to be able to do your best (i.e. maximum NS activation), being "fresh" is more important than technique during your training. Doing 2 brutal workouts in a row (e.g. 4+ big compound movements/session), and then expecting to get a good session in on your 3rd brutal workout in a row is probably going to lead to disappointment, and no amount of "activation" will work...it's simply a case of recovery
Which is why powerlifters don't usually train more than 4 days a week (to be more "fresh").
The most obvious way of activating your NS or whatever, is ramping. You simply save all your energy while ramping up with low reps until your final and best set. 9 times out of 10, you'll reach a higher peak than you would doing only 2 or 3 higher rep warmup sets. Utilising this method, it's not surprising to be able to lift 10-15% more weight than if you hadn't ramped.
Another way of looking at it is this - say for a lift you usually manage 6 reps at 300lbs. Instead of warming up to 6 reps at 300lbs and then doing it, you'd do a heavier, lower rep set first (e.g. 3 reps at 325)...then when you drop back down to 300lbs, you likely will manage more reps than if you hadn't done the heavier set first.
This is all assuming that you are not in an over-reaching state, or under-eating. If that is the case, "activating" your NS or whatever, at the end of the day, is simply an intensifying technique and is going to make you dig even further into a hole