Most people veg for two weeks. Big Bloom isn't a bloom fertilizer base. It's a catalyst among many other things. That's why in the feeding chart, plant start using it as seeds. Get "Tiger Bloom" (bloom base) and don't bother with grow big. You already bought "Big Bloom" and the fox farm soil and already decided to veg shortly. It could still take weeks for the plant to go into flower after you make the light cycle switch to trigger it. But continue using the bloom base fertilizer, that will stimulate blooming.
So use Big Bloom as your veg and for your seedlings. its very mild, so it wont really burn your plants up. Once you begin flowering start using some Tiger Bloom.
If you won't want to buy tiger bloom, the bloom base, try the water solubles. Cha ching isn't that popular, then again its opinion and some people seem to like it as well. Since your in soil, beastie blooms should be sweet in your grow. It lacks nitrogen so during mid flowering your plant can use up what it has store up. Then cha ching has nitrogen and makes you feed your plant nitrogen at the very end. Maybe it all works out perfectly together, I'm just testing out open sesame right now.
But point i'm trying to make is that Big Bloom is falsely leading people to think it's a bloom base fertilizer and it isn't. Here is the feeding chart they provide: Notice before you even start using your Grow Base, they recommend using Big Bloom on your delicate seedlings. Shows how gentle that nutrient really is and they call it a blossom builder.... People should complain about it being called big bloom.
Edit: Forgot URL
http%3A%2F%2Ffoxfarmfertilizer.com%2FFoxFarm-Soil-Schedule.pdf
Edit Edit: dont think last URL worked.
pretty sure that last link doesnt work:
http://foxfarmfertilizer.com/feedingfox.html
One part bloom fertilizers are better if they are made for the two different stages of forming flowers and ripening. I'd probably want to try the solubles if I were you.