His a times are to short Hun. Try pushing the first A time towards 2.5 hrs and give it a few days for him to adjust. Keep trying to apop if he short naps. If he is more tired you will more likely have success. If you get a good morning nap I'd shoot for a longer next A too etc. your probably heading towards cutting the CN, but not till he's at 3 hrs or so between naps.
It's a tough age developmentally too. Is he trying to crawl? Roll Sit? Growth spurting?