Daytona:
Ignore fox farms feeding schedule. They're going to tell you to feed your plants much more nutrient than they need. Why? Because they want you to use more of their nutrients! More money for them.
Grow big is the "veg" base formula and tiger bloom is the "flower" base formula. Now keep in mind, these fertilizers are not exclusive to their respective flowering stages, i.e. If your plants start to yellow during flower, it's fine to feed them some Grow big.
If you're using an EC meter, Bluelab makes a great truncheon. A safe level for feeding in soil is 1.0 EC. You shouldn't need to feed more, but it's fine to feed less. If your plant look healthy, then they have enough nutrients.
If you don't have an EC meter, a safe bet is 1tsp per gallon.
As far as sledgehammer, kangaroots, and their "bloom booster" powders: don't waste your money. People get way too caught up in this marketing hype. And a lot of people wouldn't be able to tell the difference if these bottles were replaced with water.
Their "Big bud" has things like worm castings, kelp, guano, etc. It's a decent additive, but to be honest if you are using a nice soil mix then you shouldn't need it.
Just remember less is more. Don't water everyday for the sake of watering. Don't try to "make" your plants grow. That's how a lot of people end up killing their babies. Just give it what it needs and let nature take care of the rest.
Just my .02.