Hi again,
I went through your thread. I really want to figure this out. Last time things settled down you realized it was teeth. I'm hoping that these are teeth! However, I don't think it's only just teeth.
What could be happening, is he starts the day fine..he gets a good nap, but his second A time could be too little and he may be getting OT just bc the last A time may be too long. Let's start to push his day out. I suggest early bedtime if you're worried about OT. If he starts the day early, that's fine. We can still give him a 3.5 hour A time. He's 11 months now and he should be quite fine with A times of 3.5-4 hours.
So may I suggest, 1st A time is 3.5, 2nd A time 3.75 ..and if you cut the last nap, the last A can be 3 hours.
I'm not sure if this is going to work..but I feel like we're just going in circles and we need to at least TRY something else. And of course, medicate before naps and BT to rule out teeth...