Ok I'll do my best but suspect others with pitch in
1) I'd start by doing LLRRLL... For a few days and see what happens, but if he doesn't seem satisfied by the second feed on a particular side then you're fine to offer the other side afterwards.
2-4) as above, if he doesn't seem satisfied after a feed at any point, just offer the other side, this has been my experience during a GS. I've ended up doing alternate sides again and sometimes even offering both sides at a feed for a couple of days during the GS and then the green stools have returned so I took that as my cue to return to block feeding!
Personally, apart from GS I continued block feeding until we both got the flu a couple of weeks ago. That reduced my supply and I've had to work at getting it back up again, doing some extra pumping and switch feeding, but I think we're getting there now... But that was the flu rather than block feeding, as long as you're still giving her what she wants and she's satisfied then I wouldn't worry about reducing your supply too much. DD always had so much urine I knew she was getting plenty!
The other thing I forgot to mention which you might want to try first, is feeding in a reclined position and massaging your breasts near the chest wall before feeds, both of which can help to increase the fat content of the milk she gets. Actually my LC told me that this can often be enough to put an end to the green stools, so do give it a go. Also don't worry about the odd green one, we've had this since block feeding but less, and much less mucous, don't know if you've been getting the mucous too?