I do think some OT has crept in Alisa. It probably from the significant jump in A coupled with the extremely long day.
I think what we need to do it correct this OT firstly. It will mean some EBT for a few nights to see if he can catch up. Then we can look at shifting everything later if that's what you'd prefer.
How about you try this for a few days...
Wu 5.20-6
Nap 8.30/9 depending on when he woke up. Don't worry if this nap is short.
Nap 3hrs 45mins after wu from first nap. do w2s at 30 mins. I will post a link about this at the end. Hope for a 1.5hr nap.
BT 6
As you can see from the above we're trying to keep the day to around 12hrs to catch him up on sleep. This is important especially if that second nap ends up being short as well. You might only need to follow this a for a week to catch him up and correct the OT then we can look at moving out the day a little to suit.
Wrt the w2s I think the A time is suitable for the second nap especially after a short nap. Here I think we need to concentrate on this nap and try and get a decent one in. You will need to go in at the 30 mins or so point and very gently stroke his cheek or put a hand on his shoulder to rouse him ever so slightly so you hear his breathing change. Try not to wake him completely. This will hopefully reset him and it'll hopefully help him into the next sleep cycle. It takes a bit or trial and error to get it right, some people ssh/pat through the transition but mine never liked that. I had to back out ever so quietly and leave her to it. I would do this every day for that week and see if it works.
What do you think? I know there's a lot of information here, but it think a good week of EBT will really help him out. If you could log how he falls asleep at BT for me that'll be helpful. Also how the w2s for the second nap is going.
How do I address habitual wakings? (wake-to-sleep and other methods)