Hi there,
I am sorry you have such a hard time. It can really get to us, right?!
What I am thinking right now, is that he is probably slowly going into 3-2 transition. It doesn't mean he is there yet, just that he is getting older;]
Look at the link below:
All about the 3-2 transition- 5/6 monthsIt might be confusing, because he is not refusing naps or waking happy. I am not 100% sure, but I know my DS was going through that transition just like yours. That's why I was struggling with it so much:/
I think you were right about increasing A time. It can give you no results at the beginning. There are some LOs that adjust to that change positively after a week! I know my DS let me wait for it, eh.
Also, I wouldn't worry about naps longer than 1h. During the transition naps 1h 15min or 1h 25 min are really normal.
What do you think? You want to try again with me?