it's OK to wake him for feeds - and if your breasts are full it might be a good idea. It is normal for babies to cluster feed - especially in the evening. It doesn't mean you don't have enough milk; it just means that they want to hang out with mum- breastfeeding is about more than just the milk, it's a way to relax and unwind after a big day, and chance for a cuddle with mum and more.
It's a good thing that your milk supply has settled down - once again normal.
The great thing about milk supply is that it's just about rock solid - you feed, you make more milk. It doesn't dry up and it's not hugely affected by illness. Your fabulous payoff for the daytime feeds is he sleeps so well over night. He has a lot of growing to do, so he still needs to feed a lot, but he's letting you sleep at night - very nice!