1- I've only tried it with dry trim. Wet is suggested by the manufacturer, but we don't all have the luxury of LOADS of wet trim. If you want to store trim, either dry it and store in paper bags, or freeze the fresh stuff.

2- I believe it's 10u. Rather than a coffee filter, which is rough and quite porous, a fine silk scarf with a glossy finish (silk satin) folded between several layers of paper towel is preferable.

3- yeah, break up larger buds. It's more efficient.