The first part of your post is good info... then you let yourself down..
HPS's are now made with more Blue Spectrum added, so HPS's are now used and work (VERY WELL) for the whole grow..
As for the last part of your post... Out of order IMO! Telling someone to read up is good but there are ways of telling them?! Start over ?? Give the guy a break.. they may look bad at the moment but they could pull through, they don't call it weed for no reason!!
Anyway Bridge,
All Mix has enough fertilizer in it to last around 5/6 weeks, a telling sign to when your plants need feeding is when the seedling leaves (1st or rounded leaves) turn yellow and drop off.. this is when I would apply my first feed at 1/4 strength!
From what I'v read I would say your on top of it now?
I would also advise to read.. Read.. Read and Read somemore... you will always learn something new! I'v been reading about growing for around 3 years, only been growing for about a year though and I'm still learning (I will never claim to know it all either because there is far to much to know!)
Good luck to you dude, I hope they pull through for you!