Have you already let the first novel rest a while?
I am working on my first long project right now, but whatever the length, I have found I can't objectively read & revise until that work has been put aside for a while -- sometimes several weeks or more. It is maddening, and really hard not to just stick it in an envelope and mail it off, but if I do wait, I can always make it better when I come back to it.
Why not let that first novel sit & percolate a while, work on the second one? When you are done with the second one, go back and do all revisions on the first? Then start on a 3rd one, and revise novel 2 when it is done?
I realize that is a *really* long time, depending on how long it takes you to write each one. Maybe you could go back & do revisions when you get "stuck" somewhere, to give your brain a break from the one you have trouble with?
I suggest these because I sometimes feel like I put on a skin of my characters somewhere in my brain, and can't easily get out of one & into another without changing the voice of that piece. But I put a lot of importance on characters -- I might stick through a boring part of a book or a section of weak writing to see what happens to the characters, but I'll rarely read beautiful prose just for the sake of the sound of it if I don't like the characters.
wee