I don't think I fit in with the "high activity levels or muscular builds", but I understand what you are talking about.
I would save points for a high protein snack after weight lifting, but I definitely think you can do it.
I cannot remember exactly what was said about maintance and being at goal/lifetime, but I do believe that there was an amount of activity points that we should earn each week which was a large number.
How many activity points do you earn each week?