Quick questioin for you bubble hash makers

I've been makin bubble hash with bags for a few years and I'm wondering if anyone runs the same trim through more than once. I have a few lbs of trim and thinking about spending my day making hash. If you do run the trim through more than once, how much has do you get compared to the first run? I usually pull a half oz (dry) from 1 5gallon bubble bag.

For real a half oz, from a few pounds of trim?????

Yea it ends up about the size of a golf ball

What size screens you using? I'm getting ready to do a batch and am trying to turn into an easy job this time. Trimming/ice/water in one 5 gallon bucket and then stir then entire thing using an electric drill with a paint stirrer attachment. My set was 5 bags but I'm not sure I need that much grading. I'm thinking one screen for all the trash, one medium screen and one fine screen.