When using House & Garden base nutrients should I adjust the PH after A/B is added, or after all the nutrients and enhancers are added?
Always adjust your PH AFTER you have mixed base nutrients and BEFORE additives.
Then after you have added your additives and mixed them well you should recheck your PH levels and maintain them between 5.7 and 6.7. Reason for this is proteins and amino acids require certain PH levels to stay balanced to put off the enzymes to break down nutrients. If fallen out of balance and damaged, they could possibly not put off enzymes for optimal growth.