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.