Ok so you're still using the elbow grease method. I've been trying to find a decent automated method that gives me similar yields than running it manually through the screens. I use it for edibles so go through a lot of it. The small agitator machine I grabbed is pretty good but even throwing dimes in it for some additional agitation, I'm still only getting about 6-7% return running it twice and for hours. On the 180 screen, manually I can get up to 10-11% but damn it hurts my back.
I'm trying yet another method (DIY) with some sieve screens I grabbed on AliExpress, will post up my thoughts on it once I get everything in and try it. The critical part is whether the agitators will work and figuring out how to connect them to the sieve screens.