Hi Jonniebluefish,
Big Bloom is not Tiger Bloom. BB has a ratio of like 0-.05-.07 or something like that. You can safely use 1 tablespoon per gallon every watering, if in soil/coco, from when they are about big enough to be in 1 gallon pots. Bigger the plants/pots, the more you can give. I personally never exceed 1 tablespoon per gallon of water because i use it every watering with Calmag just so the water isn't plain. On feeding days the plants don't get Big Bloom or Calmag. I use soil or coco.
Yes, FF runs hot and everyone hates it but if you watch your ppms/EC, you can use anything you want. I use GH FloraNova Grow and Bloom 1 parts so i dont have to mix anything and then ph, but then watch out for ppms, its too much for me. I keep things very simple for using "Synthetics". Good luck