When is the best time to supercrop my plants ?

I am growing hydro.....Need to know when is the best time to supercrop my ladies ?
Also what is the ideal PH level for my water ?

i usually supercrop after the first two or so weeks or flower when the plants usually finish the stretch.. i will supercrop all during flowering minus say the last few weeks of flower and haven't seen any downside to doing so, quite the oppostie honestly..
you can supercrop anytime you want to imho..