Is he acting tired during wind down and then revving up when placed in his crib or is he just not acting tired? Obviously you can't make him sleep and really, if he's happy and healthy what more could you want? Well besides a later wake up and more downtime during the day perhaps, but really in the end I bet his health and happiness trumps that.
If it's getting to be too much, go with the longer A's for awhile and see what pans out. The worse that can happen is he ends up OT (which he may or may not be now, it's really hard to say) and he'll need shorter A times and fall back onto 2 naps for awhile. I spent some time looking through schedules for 12+ month babes today and some were only doing a 1.5hr nap with 11hr night. Some kids just need less sleep. I have read numerous online sites (yeah I've been doing some research lately, can you tell?!) that say by 1 most kids need 10-13hrs of sleep per day.
If you still have it in you to keep trying for the 2 naps, by all means go for it. I'll be here to help anyway I can and I'm sure Lizzie will too. I just want you to know that if it doesn't work, by no means are you considered a failure or him a difficult child. Everyone's different!
Now, having said all that, if he is acting cranky or is overly difficult you could always try longer wind downs or start trying WI/WO again (it seems he's pretty much over the crib fear/SA, no?).