Now watch for stretch. Too much reduction will stall growth but you will see a difference if you got it right and a few days.
On your nutrition choice Grow Big. Good choice as an Organic grow. It uses leftover animals and plants not chemicals. This means that unless the wheels come off you do not need to nore is it beneficial to water to drain. Just make sure you pH the nute and water mix. My nute bottle requires 6.3 pH for the mix and I let it set for 2 hours before adjusting. Grow Big is higher in N than is needed especially in later flower so watch for signs of this and we can deal with that.
Power user tip.
During certain parts of your run you will be adjusting feeds at the same rate. Check and adjust the mix the same way and write it down. Every time.
Now I was doing this and on my 4th mix the PH was higher than the previous mix that I had done. I reached for the pH down and my brain said STOP.
Why is the different. Same graduated cylinder same mix same everything.
Checked calibration on my ph pen. Off by .7 and a hunk of organic poop of some animal on the tip. If I had not checked that pen the pH would have been down to 5.5 not 6.3. after adjusting.