Hello people,
I was wondering when mixing my nutrients how much headroom I have or how much more of said nutes could I add to my water in relation to my current PPM's???

Or how high can I raise my PPM's before my mix becomes toxic???

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slowly increase nute strength. as soon as you see tip burn, you know you're nearing burning them.

Just for a little perspective, heres my flowering feed schedule:

Fox Farms:
Big Bloom 5ml per gal
Tiger Bloom 5ml per gal
Beastie Bloomz 2.5ml per gal

Hygrozyme 8 -10ml per gal
Superthrive 1.25ml per gal

Advanced Nutrients:
Barricade (potassium silicate) 1.25ml per gal
Sweet Leaf 8 - 12ml per gal

My medium is Fox Farm Ocean Forest with extra perlite
2 8qt bags to 1 bag FFOF.
PH 6.54
PPM is about 800
Temps are:
Lights on 87F
Lights off 77F
Relative Humidity 43%

I am on the end of week 6 and I will be using Humboldt Co Own Gravity as well as Purple Maxx starting on my next feeding.

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Are those pH/ppm numbers for nutrient solution you water with, or soil run-off? In anycase, those are some nice numbers.. Is 87 as low as you can get, or have you put much effort into trying? 87 ain't bad, but its not as nice as your other numbers..

No they are not soil run off, that is my nutrient mix. I have 7 girls flowering so whenever I feed them I prepare 3 to 4 gallons with spring water. For the time being thats as low as I can get the temperature. Before I got the exhaust blower, duct work, and enclosed hood my temps were getting over 100F with the light on.

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What kind of ground is the spring running out of? Whats the ppm and pH of the water itself

Mountains of N.Carolina, 54 PPM and PH 6.72.

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Seeing as you are a beginner I would not build it above 1,200 and even then I would build it to that number slowly over a 3-4 week period. then slowly start bringing it back down.

EDIT: I just noticed you are on week 6. You do not want to build your PPM up high at this time. This is when you should be lowering it.

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More nutrients doesn't mean bigger/faster growth by any means..
Step one is complete.. That is you seem to have a perfect pH (although run-off tests are always good).. This means that you shouldn't be mislead by pH problems making you think your nute concentrations are off.. So you can just listen to your plants.. When they seem to fade, and show signs of hunger its obviously safe to up the dose by 10-15%.. Just give them about a week to show response before you tinker too much more..
At this stage in the game though, thats all off the table.. In late flowering its 100% natural for plants to yellow and drop leaves.. If your strain is 8-9 weeks flowering, you can go down to molasses and ignore the deficiencies..
Nute concentration is a really iffy thing some plants like 3x the strength that will burn others.. Apparently Lowryders would get torched by your very respectable 900ppm..
Do you have any reason to believe you need to up the strength, or would it just be pushing the limits?

ppm goes in relation with how big a plant is there is no point in hammering 2000 ppm on a foot plant u save that for the 6 footers u herd