1st grow! advice appreciated

pics from today...i've been having some problems lately with very pale green/yellow leaves...i believe its a ph problem because its similar to the problem i had during veg...added some water with ph of 7.5 (bout 2 hrs ago) to hopefully buffer the soil...i had a very very similar probleming in the middle of my veg cycle so i think its ph...any ideas or diagnostics would help...i use cal-mag, liquid karma and biobizz biobloom...every two weeks with the first feeding about 4 days ago which made problem worse...nutes have ph of 5.8...only thing i can think of is that the 3 plants with problems needed bushmaster twice a week for the last two wks. in order to limit stretching...any suggestions