I alternated 6 and 7 for awhile. I agree. It's weird that there is such a difference with one click. At this point I do 7 most days but I rest afterward (I take it in the morning.) If I have something important to do, I do 6. I still fine 8 impossible! I think alternating is a good plan. Consider the half life. That way you kind of get 6 1/2 every day!