I cant see a picture . If you grow in field soil/dirt , then a higher PH is used 6-6.8 and the field soil has a huge Cation Exchange Capacity ,so basically its gonna correct your PH if its low or high , i guess you grow in potting mix/soil then everything depends from the ph of the medium ,but going from 5.5-6.5 u cant go wrong, it needs to be really off below 5 or higher then 7 to experience problems . U can easy check your EC and PH but not from the feeding solutin , its more important how interact with the medium . Simply saturate your media with regular feeding schedule ,wait an hour and then use pure destilated water slowly poor in the center of the stem until u get 40-60ml of runoff not more not less because its gonna affect the result ,and mesure the EC and PH.
Then i will give u a table to convert your results .