need a personal opinion

first off i want to find out what people know from experience who has ever grown ak47 what they keep their ph at and what they keep their ppm at. right now i have small ones(3-4in.) at around 500ppm and 6.1ph...the rest ranging 7''- 1' in between 1000 and 1400ppm dependin on the size of the plant, 6.1-6.3ph.....is this about right in anyones opinion?....and also i got about 4 feet in total vertically to let the plants grow judgin by the distance from the light to the plants, and the size of my reflector from the ceiling. i have about 3-4 plants givin me growth problems while the rest are growing nice and bushy at a constant rate....i have been goin on floros only for about 4-5 days and took out my 600hps becuz it was burnin the little plants....now, since they are givin me these problems should i take them out and try to develop them into clone mothers so i can put my 600 back in the room or should i just let it ride to see if they get better with floros; because they are slowin the growth rate of all the other plants which are about 6" away from cuttin the light down to 12/12. any feedback at all would be great.

I,ve never grown Ak but,
Ph sounds to be fine but could come up a bit 6.7 to7.2 is ideal but i wouldn,t worry about it it,s a long way off nutrient lock.
Co2 ppm is fine Keep it as close to 1500 as posable as you probably know.
But don,t use the smaller plants as mothers as you will end up with a load of slow and small clones, as the behaviour of clones is identical of that of the mother.
Personaly i would let it ride as some plants just seem to be slow and no matter what you do they are constantly back.

Good luck
Disco....