DWC - Switch to bloom nutes?

I like to go full bloom a couple days after the 12/12 switch, but with an auto, when you start to see bud sites start. Ask what are you adding/changing when you switch to bloom? More P and K and a touch less N. The plants start to need more P at around week 2 of flower until 5-6. Then they switch to a more K based feed. The plants still need a good amount of nitrogen and calcium (especially early flower). Your plant looks like it might have a slight P issue, some red stems and the lowers are a little blue/greyish. Hard to tell with the lighting. Not bad at all though. I wouldn't stress about it and make the change when you do your next res change or on your top offs, use your flower feed schedule. My only other suggestion would be to do a little defoliation in the middle and the lowers to help air flow and increase top bud site production. Good luck!