I think you need to push the 2-1 transition.
If you have an LO prone to EW (as many of us here have) you really need to drop that long AM nap as it only encourages it. It's a vicious circle - LO has a short night so is tired in the morning, LO then has an early-ish nap to make up for the short nap but then needs a PM nap and then ends up with another shorter night due to the naps. Or you get the long AM nap but refusal of PM nap leading to OT at bedtime and then an EW and the cycle continues!
You are going to have an OT build up while you drop the nap unfortunately :-(
I would suggest only allowing 30mins in the morning then a longer PM nap after lunch. He is going to be very cranky when you wake him from the morning nap so for a few days you will probably have to go outside, give lots of cuddles etc. to keep him going. In time his body will really adjust to the PM nap. If you read my threads (think I have 2) you will see that I had an awful time trying to drop the long AM nap - LO was just exhausted by 9.30/10am and was a nightmare. At 17months she now quite happily lasts until after lunch, has 1-3hours and 11-13hours at night :-) xx