about to flower, need advice with flowering nutes

hey, im 6 weeks in, gonna go 12/12 at the end of the week and just i wasn't sure what nutes would be good

I had alot of trouble finding any really good veggie nutes so i got a 20-20-20 all around prod whatever from canadian tire, works well i guess all i see is green

now im gonna flower it its about 8 inches tall, sativa dom and i don't know if i should keep going with the 20-20-20 nutes or should i go with something like 15-30-15 or even more dramatic like ~5-30-15 ?

And I also read that when flowering your plants don't drink as much, so i mean im feeding this vegger full strength nutes every 3 days roughly and water about 250 ml a day right now and everything seems great, i know each plant is different, but rougly how much less does it drink? lol

any help is sweet thanks bros

not sure about the nutes, but you shouldn't follow a schedule of feeding a certain amount a certain time apart, feed them when the soil feels dry