12 hour switch

I am vegging 24/0 under T5, in the flip day I change the light to HPS turn all off for 24H and than starting 12/12. Feeding few days before flip with veg nutes and according to their needs in stretch, if I see some fading during this period they got veg nutes again otherwise next feed is with bloom formula...
 
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Using GH 3part.

I go from veg fert, 720ppm(5,5,2.5, 2.5cal). To transition fert at the same ppm(4,4,4,2.5cal)

Because I have one plant that's three days behind the other. Due to the seed membrane sticking to the sprout. The more mature plant is showing pisils. The other isn't. 11 days from the flip.

Once the slower plant shows pisils. Then the fert gets changed on both. Going to (4,1,5,2.5cal). With a lower ppm in the 600 range.
 
Should the lights switch from 18/6 to 12/12 gradually over a period of time? For example start cutting an hour back each day over a week or so?
 
I pick a time (usually 7pm-7am on) and continue to feed veg nutes for 2-3 more waterings depending on how thirsty they are, followed by a watering of PH’d water then it’s go time!

For 10-14 days after flip your plants are growing like crazy, why blast them with bloom food?
 
I pick a time (usually 7pm-7am on) and continue to feed veg nutes for 2-3 more waterings depending on how thirsty they are, followed by a watering of PH’d water then it’s go time!

For 10-14 days after flip your plants are growing like crazy, why blast them with bloom food?
Thank you!
 
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