You've probably seen as many clever time management schemes as I have. I don't think there exists a time management scheme or formula that's 100% reliable. Whether they work or not depends at least in part on personal temperament.
What works best for me is just doing what's in front of me. Is it a truism that time well-spent on a sound plan saves hours and days of revisions and fixes later on? When I plan too much time flies by. I say focus on what's in front of you, and let your intuition tell you what's next.