Yeah that’s a lot of nutrients. I didn’t notice any base nutes like NPK?? I use Jacks 321 and Jacks Tap. Simple 3 part dry mix and I add silica. Very inexpensive and will last a long time. For flowering times an increase in PK for the 1st 3 weeks of flower then regular base nutes with reduced nitrogen. If your going to use the MG, personally I would flush it several times to expel most of the time released nutrients. Adding a PK booster will require adjusting the base nutes and not sure that can be done with MG.
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Sorry about that.Problem for me is I dont speak spanish so very little to no communication with the owners of the shop.Went down to half of the recomended feed and curling spotting and burning is what I get.KISS back to basics hence the flower fuel and shitty well water no more ro for them!!
I keep burning everything ,spottins leaves,curling,backed the light down some with no difference.backed it to @50 % strength.Did a flush yesterday and got one plant runoff as high as 4000ppm lowest was 2000
This is from the plants in ProMix correct? When you water or feed do you do that to at least 20% running out the bottom of the pots? The unused fertilizer salts will accumulate in the bottom of the pot and root mass locking out nutrient uptake and will give those high number on a run off test 
You will also have trouble managing pH if you have a salt buildup.
Ph is a guess.Bluelab,hanna,cheapos probably more than 8 different brands NEVER test the same even with calibration solution.mix it up go from one to the other and 6.8 to read 6.2 ???Im giving up on that part hence back to well water again.I have salt intrusion so i tds around 500ppm out of the tap.Fwee epson salt??? im not sure but outside my problems were mold and pests.Shit mg soil and a feed once a week.I figured inside would be the same so im going to sit back and wath and read as much as i can.