hey Ron, nutrient schedules would have you use their nutrients as much as possible. The nute companies are in the business of selling nutes, not your plants being perfect. A hydro store will probably tell you to use a lot of nutrients as well. I've found 700ppms to be a good level and the leaves stay green. When I'm flushing I would hope to have almost all the green out of the leaves by the time I harvest. It never happens though. Still lots of green leaves coming off. But that's the goal, getting rid of all that nitrogen. Not sure but I think that's what one tastes when not flushed well, and what sparks when you light it. I could be making that up though.
You could let her go another week and get a nice heavy stone. Or harvest a little bit each day starting this weekend see what the difference is.
EDIT: Even the DM nute calculator has you adding 0 nutrients the last week.