I had a really fast let down. I am guessing some of the issues are the same...basically as soon as they started sucking, they'd get a massive hit in the back of their throats and start pulling off and spluttering. What I did was....
1. fed with me leaning back in a chair and them slightly upright.
2. let them suck till I felt the let down, then I would take them off and release a little into the towel and then put them back on again.
That seemed to fix most of it. Hope some of that helps.
I also dont fully get the reasoning for going on one boob for so long...is that to reduce the demand and therefore supply?
Hold in there...eventually their suck gets strong enough that they can cope...then they get really annoyed when its not there the second they want it