7 month old vomiting long feeds - am I feeding him too much solid food?

[Brightongirllovesgin]

He's a big solid boy - approx 23 lbs, and has 3 good meals a day. He's always been very controlled with b/f and when he's full will always pull off and fall asleep. He now only has 5 feeds in total, day and night and never really asks for it until he feels sleepy. However when he has both breasts he tends to vomit. It leaves me with very drained breasts which take a while to build themselves up for another feed. What do I do? Should I cut back on his solids even though theres pretty much no way he'll take any more feeds in the day...
He doesn't get upset about the vomiting - it can happen up to 2/3 times a week and I'm already worried he's not getting enough breastmilk, to see all this liquid gold being vomited is so depressing. Not sure what to do...