Acuvue advance contact lenses?

I have been using acuvue advance leses for astigmatism for a few months. I used to use the acuvue toric lens. What really bothers me about these lenses, is that I wear them maybe 4-5 days a week (for maybe 8-10 hrs), because I want to stretch them out a bit, like I've always done with disposables, but the things only seem to be good for about 7 wears, then they get really foggy and, splotchy. I've tried the opti-free solution, solo care, and renu (all the advanced solutions), and it seems to make no difference. What am I doing wrong?