Flower: Start with Floro's end with HPS??

I'm in a bind. long story short I took some time away from home and now have messed up the timing of my grow. I have 1 monster under my 600 watt in my flower room and then 6 1 footers in my veg room under some t'8s. My big plant is on day 14 of flower and the plants in veg could go into budding now if I wanted. I am thinking about veggin these girls for another month doing some LST then put them in 12/12 for a few weeks under the t8's till the big girl finishes then put them under the 600. Has anyone done this and what kind of results did you get?