Yeah pretty much what mcsquared said.
I recall one evening in the haven trying to frantically find withdrawal info for someone. It wasn't fun and it ended up being guess work. Typically for me, they've coasted me in with another. I guess the general school of thought and the conclusion we came to before, and mind you this might not be real sound advice, do it in the smallest possible cut backs. If a doctor is still in this equation, I'd be checking for their thoughts on it, to be sure. Some of this stuff is nasty.
I've had really bad luck trying to recapture something that was working before. I've never been able to do it actually. For a long time I was easily persuaded to try combos of things and to change dose's. But mind you we were going for something that wasn't AS. I don't do that anymore, I run the show, I tell them whats up, they just advise. While that may appear to be pretty egotistical on my part I give you this for consideration. It isn't easy for me to convey what is going on inside, but I know what it is. Where I go, Doctors are ify if I have one at all and after I don't remember how many different ones, someone had to oversee it, because they sure weren't. Also and this might have something to do with the AS side, I seem to be very sensitive to meds, in other words, recommended doses sometimes are just plain wrong with me, I don't need as much as they think and can even go below what is considered to be the least effective dose. Finally this one is listening to me about this.
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Just enjoy what you do, as best you can, and let the dog out once in a while.