Grow #3 Purple Kush

Week 8, Day 56, Day 12 of Flower. Well the girls are doing nicely again, however PK#2 is still smaller than PK#1. PK1 is 18” tall and PK2 is only 14” tall. Seeds came from same package, but PK2 sprouted 8 hours later. Both are receiving the same nutes. I did notice this morning that she did start to stretch since seeing her last night. All in all things are going well. I did notice a few fan leaves with a slight purpling so I will try adding a little more CaliMagic on the next feed. They are currently receiving 200ppm. Of CaliMagic. The last feeding was 660ppm total nutes, but 950ppm 1.9EC in the run-off so I gave them some Phed water to help clear some of the nutes building up in the media on the next feed which went down to 650ppm 1.3EC in the run-off. Thinking about doing a flush with some Florakleen, or should I wait until flush time at week 7 and 8 of flower when Trichomes are hopefully milky. All comments and suggestions welcome.