ph lockout or salt buildup? w/pics

Hey everyone. been having some trouble lately. have 6 10 gal pots for moms. the new growth looks bad and was wondering if you think its ph related. these have been growing for about 2 months and are like 3ft tall in fox farm ocean forest soil. i flushed the soil about a month and a half into they're potted life. since then i have been using house and garden nutes. (soil a & b, algen extract, roots exel, and drip clean). seeing as they were flushed not long ago with r/o water what can be my problem? i use drip clean as to keep flushing to a minimum. i ph my water to 6.5 with a blue lab combo meter so no probs there. i use r/o water on all plants. my hyro seems to be having the same problem though it is in coco running in a recirculating flood and drain (i know coco and recirculating doesnt mix, making the switch to hydroton), these plants have now been flushed twice in the past month. ph of nutrient in hydro is 5.7 to 5.8 and in soil is 6.5. although i check runoff of a smaller soil pot yesterday and it was at 6.2 while it was fed with 6.5. I have an ez clone with 4 day old babies (unpopped) and it seems as they are having the same problem. they came from these moms as well. i ph the ez clone to 5.8 and run clonex nutrient in there. do i need to flush again (man i hope not). is my ph off? should i water with ph of 7 in soil to get it up to 6.5? my rooms run great but am not sure why i have these probs in soil as well as hydro. (hydro ph never strays more than 0.2 from 5.. pls help. thanks!

I would check the ph of water before adding food and after adding food. Different foods can cause a change in your ph, I learned that the hard way

those plants look fine? ......and idk if you do this or not but ph your water only after all neuts are in casue neuts change your ph.

ya for sure its ph'ed right. i just think soil ph is just low, gonna bump up feed ph to 6.8 and water with 5 gallons and see if that helps. my coco needs flushed once a week (im so glad im phasing that shit out). anyway, thanks for the help, can anyone come up with something rather than low ph blocking out Mg?

how often are u adding nutes to your waterings? have u noticed any honey due like residue on the leaves lately ? it looks like a nute lockout which could be from salinity i dunno.
id hate to scare u but they are looking like the way my plants did after what i thought was lockout and they all died.

Ya for sure I think they are locked out. Starting to think the soil is holding salt back. Adjusting ph has really done nothing. That's the last time I buy a bag of fox farms soil.....Unless proven otherwise