are you back to feeding every 4 hrs? I think pp is right - he may be caught in an OT cycle now...I'd say try keeping the morning A time really low key (quiet toys, sitting in your lap with one toy etc) and maybe only 1.5 or 1.75 hrs (after he gets up total time including feeding and wind down). What do you do for a wind down routine? When you say pat/shh doesn't work - does that mean he just cries the whole time? Is he swaddled? Also, if his first nap is short, then the A time for the next cycle should be almost non existent - just basically feed, diaper change and wind down (if you try for 2 hrs A time again, he's already OT, and will just get more OT) so for example, given your earlier routine, here's what I might try:
E- 7.30 am - formula
A - quiet toys, low key activity
S - 9:00 start wind down
Y - maybe you'll get a bit
if he wakes after 30 min, I'd try to get him back to sleep with pat/shh - or whatever version may work best for him - some babies like only patting or only shhing or rubbing etc. you kind of have to experiment a bit. So let's say he actually falls asleep by 9:15/9:30 and wakes up at 10. I'd only try to extend his nap til 10:30 or 10:45, then get him up, have a little cuddle time and start the next cycle:
E - 11 am - breast milk (he may be hungry earlier if he's been crying while you're trying to extend his naps)
A - not much here, diaper change and a bit of cuddle time
S - 11:30/12 - start wind down (I wouldn't keep him up more than 30 min after he's done feeding)
Does that make sense? If he's OT (and it sounds like he is), you really have to somehow break that cycle so you can really work on the sleep training. What I'd do with my dd is the last nap of the day, I'd just do whatever I could to get her to sleep if her earlier naps were bad, so that she'd not be so OT at bedtime and would sleep better at night and we could start fresh in the am.
HTH
michelle