Those 3 part nutrients are my favorite base. It works well in soil but it really shines in hydroponics.

I tend to stick with hydroponics myself, but a good soil-less mix will let you find a kind of happy medium between the two. It's definitely a good thing you went easy on the 3-part and other nutrients if you had a decent soil base as well, since it's especially easy to over-nute in soil and much tougher to flush if you do.

But yeah, that's good advice on the dosing. Lighter is better and being conservative kills a lot fewer plants. Have you tried any other 3-part nutrient formulas?