What I did was to top up with just water and gradually reduce EC, then after taking my first harvest, when I decided I was gonna let them go another week or so, I gave them a 25% strength shot of Canna Aqua Flores just to bring EC up a tad and delay yellowing for a cpl more days. The lower buds visibly swelled and hardened a lot during this time so I am certain my yield benefitted greatly from it. Taste doesnt seem to have been affected and the buds smoke down to a "healthy" white ash. After a good long cure im sure you wont notice much, if any, diff between the tastes of the two crops. It sounds like you have everything well dialed in and im sure this girl will yield big for you. I think I used my own shot of pk13/14 too early for one or two of the plants. Wait another week or two until you have some spiralled clusters of flowers forming up the stems then give her her dose