strawberry diesel grow ( 2nd grow attempt)

there has been some considerable stretch within the first few weeks of flowering. not in any specific order but plant heights were as follows.
befor lights were changed to 12/12 heights where
32cm now 60cm
28cm now 60cm
20cm now 40cm
28cm now 42cm

tried doing some very light lst on the plant that was topped you will be able to see which plant from the pictures, as i was doing the lst to open up the canopy of the plant to allow more light threw to ...

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most recent pics here, grow room set up, nutes been used and of course my babys. will get better quality pics when lights are of.

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these are pics from 2 weeks ago where i was experiencing some problems with the health of my leafs...all plants where under a month old

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my girls have been in flower for just a week now, still waiting on one to show its sex but confirmed 4 females. keeping temps a very constant 79 and humidty very constant 45 during lights on. and 61 with 40 humidty during lights of. i have just started feeding the pre bloom cycle getting the ec up to around 1.1-1.2 ph always 5.9-6. stretching is already occuring. heights of all plants last week were as follows.
35cm now is 47cm
32cm now is 45cm
28cm now is 36cm
18cm now ...