shanep -- I think you need to re-start at the beginning
burnt is from over baking, grainy is from tumbling to long.
Have a couple boolits in the bottle you mix the solution in
after you mix the solution, let it rest/incorporate for at least 30 min
rule of thumb, use 1 mil solution to 1 pound of boolits, less in the first time around, - this helps with adhesion (make sure you adjitate the solution well immediately prior to measureing and adding to the boolits (the solution settles fast)
1) confirm oven temperature: Place a tested oven thermometer in the middle of the shelf you bake on and adjust the oven until the thermometer reads 400°
2) they look grainy to me, -- you are tumbling too long -- Shake/swirl 15 – 20 seconds MAX if the sound changes, you've gone to long. it/s OK to dump them damp
3) make sure they are COMPLETELY dry before baking dry in front of a fan (it helps to warm them on a grate on top of your oven for 12 min before baking)
4) bake for a full 12 min (cover the bottom of your oven with something that retains heat I use ceramic BBQ briquettes, some use firebrick or chunks of metal -- this helps the oven get back to temperature faster.