Glad someone else was wondering about this too. What I have been doing is a large carb up day on saturday with about a 60/40 to 70/30 mix of high/low gi totalling about 500 to 600 g of carbs. Then sunday change the ratio to 20/80 high/low gi totalling about 300g. 300g is about 50g higher then what I would eat daily if trying to maintain. The idea behind it was eat alot spread over saturday high gi to spike the insulin and the low gi to help sustain. Then Sunday less high GI to reduce how high the spikes are. When I was did two solid days of High gi carbs I felt terrible on monday and tuesday and had bad cravings. tapering down the amount and switching to low gi's on sunday has helped alot.
EDIT: If this line of thought makes absolutely no sense please feel free to set me straight. It would be much appreciated.
Speaking of leaning up, right now I'm in the 6th week of a 7 week cycle finishing off with Phera-Plex and the results have been awesome. I started probably somewhere around 14-15% bodyfat and now I'm at the same weight as when I started but I have a complete outline of my abs and have added some strength and size to my whole body. Getting completely shredded for summer will hopefully only take me about 4-6 weeks after PCT.
Is it necessary to wait a month before lowering cals below maintenance? I just started the AD and was looking to use it to cut before the summer. I really only want to be on it for 2 months. Can I start lowering cals in 2 weeks or will this run the risk of losing muscle mass?
another thing to mention - after that 12 day intro and my first carb up the following low carb week I was starving all the time, the next week was a little better and so on. I think appetite may be another reason you are supposed to wait, that way you are not below maintenance and feeling extremely hungry. at least for me that would lead to cheating.