How much does he take at a feed?
How long is taking in feeding with the bottle, and which teat are you using? (I remember you asking advice on which teat you should use in the bottlefeeding forum).
You could always go to 3.5hr EASY, and either feed at 2.30, 5.30pm and a top up at 7pm just before he goes to sleep, or keep it like it is and bring the dreamfeed forward to 10pm.
Is he still waking up to be fed during the night?
I wouldn't try to extend A times for the time being as he is not getting enough restorative rest at the moment. Maybe he is overtired, do you go by the clock or read his cues?