I earn somewhere between 50-70 AP's in an average week lately (except for last week - 36) and I don't take from AP's. I usually use around one quarter of my weeklies, but play it by ear. I can completely understand and appreciate the philosophy that by taking from AP's you are taking points that you "earned" but I think that especially if you are entering an activity instead of intensity in etools, some points seem a little high or low. And I don't like that I'd be opening myself up to taking from a potentially unlimited pool.
I tend to dip slightly into the weeklies on days I strength train for a little extra protein, planned splurges, or just a day when I have unexpected hunger. I try to listen to my body and fuel it when I feel I need it, but at the same time I don't want to eat back all the calories I just worked very hard to burn off if I know I don't need more food.
Edit: Oops hit reply too soon! I meant to also add you'll probably see that everyone is a little different. WW is great in that there's room for flexibility and tweaking, but sometimes it can take a little bit of trial and error to figure out what works best for *you*.
I'm sure you'll find your groove soon!