I would echo the comments here. "Granularizing" (is that a verb?!) next actions and having (perhaps) more discrete categories is helpful, and I find 2 (3 at the most) pages of next actions before I re-write my lists is the norm. I find a couple of things: I'll know when it's just too distracting to look at all the highlighted (completed) items, because I'll start to become numb or resistant. It's subtle but noticeable. Also, until I get to that numb point, I really like seeing that I've accomplished a bunch of things - makes me feel like I'm on a roll!
I just re-did my contexts recently and it's made a big difference. I tend to always go by how the system FEELS. Do I feel that great sense of relief, energy, focus & control? Or is something "off"? You'll find your sensitivity to that feeling gets more acute as you work with the system - in fact, that's one of the benefits!