This is the time when milk supply swaps from being hormone driven to being suck-driven.
:yeahthat:
I would maybe try & feed off your right boob first, then offer the left - so that he's not too hungry & frustrated with the left side. If he won't stay on at all, and it's not going to stimulate it you could try expressing on that side for a bit after he's finished feeding.

I agree with KMN if he's gaining weight, having wet & dirty nappies etc he's probably getting enough milk. I suspect it might be the reason for the longer evening feeds?

Bottle refusal - I don't know, we have the opposite problem but I think the idea of laying him on a cushion is a great one. Pie often feeds better like that anyway. Also if he will play with it, don't make it an issue but let him muck around with it a bit & he might just come back around? just a thought.

Good luck