I've only used the powder.
I also use Rez Dog's Recipe from IC.
I hit my plants every 2 weeks starting week 2 of bloom and stop after week 6.
So that's 3 doses in all.
I let my ppm's drop during the week I plan to add KB, bcuz I use a full scoop.
A full scoop adds about 300ppm to my solution.
I scoop some water in a cup from my cooler, then add the KB to that and stir it until it all dissolves.
At that point I pour it all back into the cooler.
If you just pour the powder right into your rez, all the powder won't dissolve and some will settle on the bottom for a while.
My dry harvest on different strains is below in my link along with DETAILED grows if you want to verify.