The only thing I say do differently is the germination of seeds.. Soak seeds in chlorine free water only until they sink (that's all the saturation they're gonna take), stir every hour until they sink... Once they sink, fill up a red cup with light warrior or whatever "light" bagged soil (one bag lasts a year almost..), wet the soil, let it drain, it'll take a few tries... Let it drain good but as soon as it settles place seed 1/4 to a 1/2" down in the center of the cup, cover up with soil, put under 1 cfl on 18-6 and walk away, they'll be sprouts in a couple days...
I just don't agree with letting the roots get hit by the light... If your gonna grow it hydro, ok I get it but if your growing dirt, start em in dirt. It cuts out the human/idiot-proof factor.. I know probably half the people that grow do it this way but the other half is doing it some way similar to the way I mentioned with peat plugs or whatever other medium in a cup without the paper towel
Other than that; I think if u listen to spicy you'll on your way to proper growing real fast... Keep it simple... You'll eventually figure out everything is not as exact as you think it is now, and the things that are important now will me nothing once you figure it out a little... If you ever think you know it all, your fucked...
The more I grow, the more I realize I know dick about it and need simplify my methods more than I have...
I recommend leaving the peat alone if you plan on recycling your soil, you can use soil with peat in it but it should be a coco dominant base you start with, the amendments don't matter except castings perlite and coco... Peat breaks down into something that helps produce bad fungi... Coco breaks down in to p or k... (I'm chinky eyed high right now on some qush ATM.. So please forgive me if I'm off....)
I have to say if that's your mix above spicy; I'm liking it... Very simple but effective... I have yet to get my hands on some crab shell meal... I have been trying oyster shell meal along with powdered lime as well as some other stuff that took a year to find but I finally got some...
I am still using supersoil along with an amended base, my base is 100% recycled but I re amend with castings, perlite, coco and whatever amendments every run...
If you were getting that N toxicity you need a bigger buffer, it's tough to grow with SS in 7 gal smart pots cust they aren't big enough, my last run I measured out the % and then added the amount of base needed and mixed the SS and base using it globally basically... But I plan to run 10's from now on if the batch I plan to try go good.
I can't say enough good about castings, if you OG poster are serious about growing organic, use them appropriately and excessively but just aerate properly with perlite or whatever... I started a worm farm with 2 pounds of red wigglers and they have spawned Into god knows how many now... Get them on hand at all times and use them, even better with good trustworthy compost...
But as far remineralization, I would say either cut your amount in half and see where it lands you if you wanna reapply every time or use whatever your using per cubic foot or whatever but add your trace every other or every 3rd cycle of amending, unless you see you need it of course. It's trial with your strains, some want more some want less...