I have noticed the two bigger Plants the EC was lower then the recommend and the soil PH was around 7.0. I have this weekend given more Bio grow for just this two plants and PH the water at 5.5 to lower the PH as the Advance silica when in the flex tank the PH goes up very quickly. I have change to only give Advance Silica when top feeding.
Flashed one of the plants as PH was 7.6 and EC 2.4 today.
Burnt tips is a sign of nutrient toxicity. You probably have build up in your soil. You can either flush your soil with 6.2 pH'd tap water, or just do a watering or 2 with just 6.2 pH tap water. Flushing will be the quickest way to remedy it. I'm a big advocate of flushing your plants at least once in a grow. Especially after week 2 of flowering.
Honestly I am surprised you have not had a chemical reaction to adding different company products together. Growing in coco it is high irrigation or Hydro in a potter. If your ph is climbing then your feed is not strong enough or you are not using proper ratios for your plants needs.
They are looking prey good!
I see this is your first grow on this profile, I don't assume you have never grown before but if you have not, your going a great job.
Some of the leaves are showing a slight N tox, dark green glossy leaves and tips that point downwards aka the claw.
You might want to lessen up on the N a bit so it can recover from this.
Good Luck!
santos45
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