I thought this thread was more about time under tension rather than target muscle tension, but I guess like Way said, if you're more aware of peak contraction/pace etc it naturally lends itself to better stimulation.
Personally, my tension quality ALWAYS goes to ruin sooner or later, it's just a matter of time (maybe it's my personality? Too eager?) don't know why but it happens. This is when I kind of integrate my de-load in with better TUT. That is, reach a sloppy peak...drop the loads a little and focus on quality more, until it gets sloppy again and repeat.