In my experience shifting to a 4/5 schedule won't cure your burn-out. You need to take a vacation, 1-2 week vacation, to really get rid of that burn-out feeling and "recharge" yourself. And if you come back and within a week or 2 feel that dread feeling again, then it's time to move on and find something else. As everyone else has said, being unhappy ever day is no way to live life.