I found that when I was really full it was too hard for DS to attach. When your milk first come it it's like trying to fit a basket ball into a little mouth.

Perhaps try hand expressing a little off before a feed to see if that makes it easier to attach.

Also don't forget it isn't too late to try the breast crawl. You'll need some quite time (which I'm sure is in really short supply in your house) but it might be worth a try.

HTH
Spring xx