I'm a big fan of Mega Crop one part and ProMix HP !
Extra Cal/Mag and ph down are not necessary.....
I start feeding right away with 1g/gallon and roughly follow their feeding schedule right to harvest.
And yes, the leaves will stay green all the way
I've only tried Bud Explosion sparingly and don't feel it worth the effort/$.
Their web site has a table where you can enter the amount of water you are mixing up and it will tell you how many grams per that amount and that stage of growth. I also watch for slight yellowing on the bottom fan leaves to tell me when they are ready for an increase in feed.
Also watch for leaf tip burn. If you see it your last increase may have been too early.
Some say if you don't have at least some leaf tip burn you are not trying hard enough
Current grow on day 10 of 12/12 for a total of 51 days @3.6g/gallon...
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BTW > my 25# bag had small balls in it, can't remember which element it was but I use a coffee mill grinder to incorporate them...
Cheers