Hopefully, I've just finished my final draft

My best friend in Chicago started reading my book two days ago, god bless him. He managed to get nine chapters in before we talked and he pointed out an obvious flaw. I can't just separate my POV changes inside chapters. I just need to stick to one POV per chapter. So, over the past day and a half, I submerged myself in rewrites again. Hopefully this will be the final draft before it goes back to the publisher. I really want to get it back to her before she forgets or isn't interested any more, but I am glad I didn't send her the previous copy. This one is much better. Is it just me or does it feel like a book is never done? Have any other authors felt like their book was just as good as it was going to get after their beta readers got done with it?