I just had a usually great sleeper fight naps and bedtime this past week, so I feel your pain!
Could you try to put him down a bit earlier? From 11:15-2:30 is a little longer than 3 hours. Maybe try to get him down even earlier? Closer to 2 1/2 hour of awake time like the morning nap?
Or, it could be hunger. I just realized that my DS (4 1/2 months) was just hungry. I breastfeed and had more milk in the morning, but my supply must be lower in the evening. I had to get off the babywhisperer easy (hopefully just for a few days until my supply meets his demands), so my EASY looks more like EAESY. I make sure I am not feeding him to sleep though. I give him a feed before his nap, but make sure there is a short activity between E and S, even if it is just a diaper change. Maybe he needs a few more ounces in his bottle. Do you give him 6 ounces, or do you let him eat until he is full? Maybe try filling the bottle to 8 ounces and seeing how much he drinks (if you aren't doing that already). Or you could give him a few ounces with the solid at 12:30. I haven't started solids yet, so am not sure how people here do things, but if he's hungry, he's hungry!
