How much is too much?

So I just finished with my first grow, and my second grow has already been in veg for the last 2 1/2 weeks. My first grow I kept it fairly simple, I used FFOF soil, all three FF nutrients, used 1 to 2tbs of molasses the last month and a half, and for about four weeks I used Dutch Masters Penetrator and Saturator as my foliar feed.

So now I've been looking at Purple Maxx and Gravity by Humboldt Country. I've read many different things about each, to sum it up the Purple Maxx (aka Snow storm or some shit), can not only help promote purple bud (typically more so if the strain has purple genetics), but also help with trichome development. The Gravity is supposed to cut down on harvest time up to 2 weeks while promoting massive bud growth (however it is said you lose some potency of the bud).

So like the title says, how much is too much? Can I use all these products with successful gains, and potent buds? Is it possible any of the products I'm currently using and the Humboldt Country products I want to buy might clash and burn my girls to hell if used together? Ideally I would like to be able to feed my plants nutrients and add the purple maxx/gravity to the nutrient feeding. Is this okay for the plants? I have a ppm tester which I know is mostly for hydro, but I found a log that gives the grower an idea of how high the ppm's should be during each stage of the grow, I used it for my last grow with great success and zero nute burn. Thanks for the help everyone!