Please help my plants are scaring me

Please any info would be greatly appreciated plants are in 5th week of flower I've been watering with Botanicare nutes liquid Karma,cal Mag Plus! bloom and sweet and it seems like my leaves are either drying out or burning can't tell . These are 3 different plants my pH levels when I water are 6.6 I water every three to four days as needed depending on how dry the soil is

Have you ever flushed the soil before? Looks like salt buildup in the roots to me, I'm not a soil guy so I could be very wrong on this one, definately get another opinion

Too strong of nutrients and leaves that are brown look like they were in the sun, ect more than other side of plant (heat wilting)

did you feed it every four days with bottled nutes? most people water nutrients in on every other or every third watering. idk what you lockout is though. id flush it

Yes I put nutes with every watering can this be why?

that most definitely looks like chronic overfeeding. pour a good amount of water through the pots, at least 4 times what the pot holds, and do it slowly, don't just dump it all in at once, give it time to leach out the salt thats built up in the bottom of your pots. from now on when you water, make sure you're pouring in enough water to get a little to come out of the bottom, and about once a month pour an extra gallon of ph'ed water through them all before you feed, to avoid this in the future.
i've found you hardly ever need calmag in soil, only use it if the plants are showing signs of deficiencies, usually little reddish "freckles" on your leaves is the first sign of cal deficiency.
i'd feed once a week, water with ph'ed water the rest of the week, if they seem to be wanting more, you can bump it up, if you give them too much, this happens

Thank you guys I'm flushing them right now as we speak

So after flushing should they be ok?

Dead leaves never get better, but the key is keeping it from happening to any new growth