KissinStars, for my last grow I used the complete line of FF fertilizers, I used the three that you mentioned, plus Open Sesame, Beastie Bloomz, and Cha Ching. It worked out quite well. However, one guy on this site used only the three that you're using with reasonable results.
No matter what fertilizers you choose to use, and what feeding schedule you go by, please make sure to do yourself a favor and adjust the pH of the solution that you water with within the proper pH range. I like the watering solution pH to be between 6.2 and 6.4. If the soil is properly buffered (FFOF soil is properly buffered), then watering as described above should maintain a proper soil pH. A good range for soil pH is about 6.5-6.8.
You will find a good digital pH meter to be very helpful in measuring solution pH. Most meters, however, aren't designed for testing soil pH. There are ways of testing soil pH indirectly, but don't use the average pH meter directly in soil.
Bombbudpuffa ( a respectable grower) tests the pH of the water that he's feeding with, but doesn't mess around with measuring soil pH. I followed his advice and had no problem. So, as I said before, if the soil is designed to maintain pH at a certain, proper range, then testing soil pH might not be necessary. FFOF soil pretty much does that for you. I like to add a tablespoon of dolomite lime per gallon of FFOF soil in order to provide magnesium. Plus, I believe that the lime might also help buffer the pH as well. If using FFOF soil, the dolomite lime isn't absolutely necessary, but is recommended by some of our most experienced growers.
Good luck.