My Flowering has Began, How Often To Apply The Flowering Nutes?

I have several starting to flower in 5 gallon buckets @ 5'6" tall measured from the rim.
I use miracle grow tomato 18-18-21 @ 1/2 dose every 2 weeks. (sorry connoisseurs).
I have applied my first feeding of MG bloom booster 15-30-15 @ 1/2 dosage.

Its HOT here and they get 6.5 hrs of direct sun and need 1/2 gallon every AM or they start to wilt by the evening.

Do I apply my MG BB in my daily watering or spread it out?

Thanks

I feed once a week 1/4 strength AFTER I water, and I always water to the point of heavy runoff to flush the soil of residual salts.
Plant Prod makes a similar product 15-15-30 I use for late flowering to fatten up the buds.