I have black spots and burnt edges on a couple lea...

One spot is not the end of the world, no plant will ever have 100% perfect leaves, 100% of the time. Definite burning though from too much feeding, half strength is usually plenty strong enough. I would also be dropping the baking soda (too alkaline) and reducing the application of hydroguard to once evey 14 days. Remember too, what is now showing in the leaves is what occurred in the substrate 10-14 days ago, so expect a delay in what you are giving to when you see results, but upping the cal/mag/iron won't hurt, especially in a soil-less grow. Cheers, Organoman.

If you’re in soilless you needa get that pH down

Yes, I am using Maxi Bloom I forgot to update the nutrient schedule. I am monitoring PPM and PH runoff. I'm targeting a 6.5 pH runoff, and my runoff PPM has been 20% higher than what I've been feeding.

It does look like excess nutes to me.. are you still running maxigro tho in flower? You need something with less N