Yes i realize you are going to start flower....

But even then.....you dont need to add some stuff that may allready be in the soil.

Remember its more about POTENCY than yeild.

Unless youre a dealer i guess.... WHich I dont think you are....

POTENCY is what you want to focus on.

Give me one ounce of dick in the dirt weed over a pound of so so shit anyday.

The size of the buds has little to do with potency.

Potency factors can be increased in flower stage with:

lighting
predators
humidity
UV Rays
watering
trimming
altitudes

Ferts can increase a size of flower and influence harvest....and speed / rate of growth...

But the main factors are still genetics and environment that govern POTENCY of the flowers themselves....far more than nutes.

I say just see where the buds develop and add trivial amounts of whatever you intend to use...the plant will produce as it is inclined.

I have smoke huge buds that sucked ass!

(And paid good money for em too cuz they looked and smelled great)

Again, nice plants.