don't start feeding him more at night, slowly reduce even the amount you are giving if bf or if formula fed water it down a bit and he will naturally start taking more during the day...i will repeat - slowly - it takes time to get adjusted!

if you start getting him used to taking full feedings at night he will stop eating so much during the day and that is not good as he will wake more and more for feedings at night the more you feed him. you want him to take more calories during the day. at this age lo may need a short feeding at night - that is why i say slowly get him off of them - but i would definately deal with the wakings for now til you have a 4 hr routine established, as he will be able to last longer between feedings and take more at a feeding. also, you can try for the df at 9:30 or 10 it may work it may not - and you are just topping him up so it shouldn't necessarily be a FULL feeding at that time - doesn't have to be 4hrs apart anyway.
the df is meant to do it while he is still asleep. if he is that restless of a sleeper have you tried just feeding him still in the crib - haven't tried it myself as i bf, but have heard of ppl doing it this way, and as long as he stays asleep and relaxed shouldn't really need a burp anyway. just a thought. if it still doesn't work for you - i haven't had a chance to read your other post yet sorry!...maybe you want to stop the df, maybe it doesn't work with your lo.
again, once you start eliminating some of the night calories and get to a constant 4 hr routine, he will naturally take more during the day, so keep offering the six ounces don't force it if he doesn't want it, he knows when he is full...you may be surprised one day!
i also think that maybe you want to try an earlier bedtime for a few days to try and get things back on track - he is probably a little overtired with all the night wakings - it's not restful for you or him or anyone else in the house.
i will be away for a little while but there are great mods here that will be glad to help you if you need anything!! good luck!