Aphids After Pruning

I have a greengage tree that up until yesterday had a pretty hefty burden of aphids. I did the annual prune and cut the vast majority away as they were located on the newer growth. There are still quite a few left which I was going to blast with the hose, however, there turned out to be quite a few ladybird larvae/pupa/eggs so is it OK to just leave them to take care of the rest? I don't really want to be getting rid of the larvae, I spent a good while yesterday picking them from the clippings and putting them back on the tree. I know by leaving the aphids I'm running the risk of them going berserk again but I'd really rather let nature take care of them. Is this a good idea or a really bad one?
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