My LO would also wake in the early hours of the morning and I would feed and she'd go down for another hour or 2. I would then do a feed when she'd wake (which was more or less a top up feed) and we'd start our E's from that time. So don't think they have to have a full E when they start, it doesn't have to be strict EAS, if you know what I mean.
I forgot about them being twins and premature, sorry
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! Definitely then cut back on A's and if they can only stay up for 2hrs, then don't push anymore.
Great to hear little twin slept well last night. Sorry to hear she puked, I hope she's not coming down with anything and it was just a one off
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With regards to feeding them before sleep, as long as they are not falling asleep on the bottle every time, you should be ok... if they are having a feed and then need a nap about 30mins later, that is ok.