Sour Diesel Auto Late Season Start

Constant liquid feed @ 150 ppm N 10-30-20. Terrible week of weather; full overcast and rain the entire first week of flower. The bloom boost is not what you want to give a plant during those dark days cuz you can see all the stretching I've got but it is what it is, wanted the extra P & K in there. Switching to Calcium Nitrate 15-0-0 @ 100 ppm for a few days this week or at least a good flush to get some calcium in the rootzone and flush out any of those extra salts and then back to the normal 200 ppm N of Jacks 18-8-23 next week.