This is really interesting for me, Danny. I find myself in kind of the opposite position to you. The editing bit fills me with a mad kind of joy. It makes me rub my hands together and grin maniacally. Conversely, getting the first draft out of my head (where it's obviously perfect) and onto the page (where it's obviously a load of crap) is more painful for me. I don't hate it, but it's not my favourite part.
What I do is every certain amount of first draft vomit I manage to spew forth, I reward myself with one editing pass of the previous chapter. (Not more or I'd get stuck there in the fun of editing). Can you do the opposite and reward yourself with some fresh writing after you edit every however many words? Might work if you have a second project on the go, for example?