auto amnesia grow

Plants are growing steady beside the nute burn plant can seem to get it growing back right after accidentally spraying the leaves with feed. We fed the plants there first dose of kool bloom today day 20 may be early, we will see.We did a water run off test as well and the p.h. is 5.6 seems a little low if anyone sees this and would like to comment on if its too low or how to get it back to the 6.2 range we would love some advice on that. *UPDATE* day 22- we started low stress training today the plants have seem to take well to there first feeding of koolbloom. I also notice when i was low stressing the plants an odor coming from the plants this is exciting to us because of all the auto's we have grown to date have never had a smell this early .