Only prob i see (with seaweed extract) during flowering is it can increase the use of N by the plant and "stretch" the plant. I definitely wouldn't use it during the last half of flowering.

I use high p Guano myself. In the last third of flowering now I'm going to make some tea from the stuff, as in five gallon bucket, RO water, bubbles (air, not the entertainment ant the last bateleur party you at) to break it up. I'm not into solids the last part of flower. (let you know how it turns out)

Solids I mix in a 'medicine bottle' with little RO, shake, and dump on the soil surface. then water (always water after solid dumps). I mix then dump, left the stuff in the bottle for a couple days once. That was a smell.