Dry Ice extraction is the latest rage and is the beezkneez for quick kief extraction.....
If you just use a @150-160 bag and start your agitation at one end and finish at the other end of your surface platform, you will visually see the grade differences. Others use a 220 micron bag the same way, but I suppose its just what your looking to obtain in your end results.
I just ordered a Kanga Can, that comes with a 152 micron sleeve bag, for easy smaller 1 gal runs and look forward to multiple playing opposed to running large sessions at once in a 5 gal.
I'll be both playing with pressing, bho, qwiso, and some butter fun with the results.