First Auto run (I thought)

Day 70 from seed. The autos are getting close, I want to do one more flush before harvest. I definitely want to spread out the royal runtz, plant 4 is getting big. The two autos of wedding cake look different, plant number two is frostier with smaller buds and plant number 3 has some fat tops. I did not top any of the four plants in the tent thinkin they were all autos. They look happier after increasing my feedings/waterings to 1.6 gallons per app. I had been feeding 1 gallon p/p but I think that was causing nute build-up. January 7 flushed plant number two and number three with 6 gallons of pHd tap water each (my tap water has EC of .24 and ppm of 168). #2 started with EC of 4.6 and 3209 ppm, got it down to 2.9 EC and 1480 PPM (still high). Plant #3 starting EC 2.7 PPM 1900 down to 1.1 and 745 PPM after final flush. Should take five days for these plants to dry out I may do one more flush but I'm thinking the remaining nutrients are going to be used by the plant over the next week.