Unsolved Mystery, can you figure out this problem?

[usmcDevldog]

OK so Ive been down this road before and here it is again,, But I cannot figure out this time exactly what is going on here. my PH is a lil high so next watering im going to bring it down with some "down" (im not far off just around 7.2) so im going to water with 6.3.... I know it seems like a cal/mag def, but ive been giving a light supplement of cal/mag every watering... which is where I think might be the problem??? since I am using tap water there really isnt need to supplemental cal/mag ive learned..
so my questions are.....
what are your inputs????
If i water 6.3 and stop with the cal/mag should this correct my problem????

P.s. i have a light infestation of spider mites and that is going to be cleared up quick cuz I brought hell upon them this morning and will continue to bring hate and discontent to them until they are gone...
I have attached pictures as well as a cool macro shot of my Icy ladies (new phone has macro feature!!)
Strains are White Widow (whos showing the worst signs), and ice & chrystal

 

[JJ Bones]

Anyway to stop using tap water and get some good water?

 

[needlesriver]

Looks like a burn try 0/5/5 or any thing you can find that is 0/#/# cut down on water its eraser to fix a under feed plant then trying to wash all that back out
Hope this is not to late to help