Dude your on the right track, everything looks killer!
I like to feed/water/feed/water, i use botanicare. Some people say feed/feed/feed with botanicare too but I like to give a plain water in-between so they are forced to finish up what nutes are left in the soil. But your stuff looks great man, if its working for you go for it. Just be careful of salt build up as the weeks go on.
As for ph, if your ph is in the right range naturally, don't mess with it. Mine comes out of the tap around 8.8 so i have to bring it down. You want to be in the 6.2-6.8 range for soil. i keep mine around 6.4-6.6.
I have to say this is one of the best first time grows i have seen.
I just read the whole thread start to finish so I'm going to comment on a few things from way back...
PPM definitely matters in soil, I start off around 300 and work my way to 1500-1900 depending on how they are taking it. The scale on my meter is ec X 700.
I wouldn't add peroxide to your soil.
As far as spaying goes, don't unless you absolutely have to. Like if you have an infestation. Definitely don't spray in flower after you start to see buds. If you must spray I use amamax. It will knock down any bug in your garden and has never done harm to any plants i have used it on. 99% of the time I spray is on outdoor plants because it is a lot easier to get a bug problem outside. Last year I had a good year and didn't have to spray at all.
Coco is a great substrate, its a little more involved than soil, but not by much. You definitely want to have you ph and ppm in line when using it. There are no nutrients in coco so you have to add nutes from the start. I do a 66% coco/ 33% perlite mix.
I do the same with my soil, 66% ocean forest/ 33% perlite