Mmm, maybe him coping with the 3 hour A time & still producing a 45 min nap was because of the really good long nap prior to it. Then he didn't cope with 3h 5 mins because the previous nap (although still of good length) was shorter. Or maybe it's like before & he's just getting used to the longer A. Like I said before, I'm still learning myself but it looks like you are getting progress. If you get a good nap again this morning, do you think it might be worth sticking to the 3hr 5 mins Second A to see if he adjusts?
This is such a hard time for our LOs & I feel you're all doing so well