Here is a video of Rick Simpson making his RSO:
The yield is higher grinding the material, but so is the pickup of the non targeted elements from inside the plant cells, adding to the bulk. The goodies that we covet are on the outside of the leaf cells, so no need to rupture leaf cells by grinding.
The key is to have adequate agitation to eliminate dead spots and keep the boundary layers removed as they form.
When the solvent and trichomes first come into contact, 100% solvent is 100% agressive, but as it dissolves the trichome, the solvent in contact with the trichome becomes more and more diluted, so the dissolution process slows down in that boundary layer interface to a crawl or halt.
Rick used Varnish and Paint grade Naphtha, which is non polar, so less prone to pick up polar elements like chlorophyll using his stir with a pharmaceutical grade 2X2 Pine stick at ambient, and recover in a rice cooker technique.
Using polar ISO and soaking at ambient temperatures will extract a boat load of chlorophyll, which makes a harsh dab that tastes like shit, and some folks get severe gastric disturbances from concentrated chlorophyll, besides it tasting like greeeeeeeeeeeeeeeeeeeeen shit, so suggest considering the QWISO process instead.
If you are going to eat this, consider using 95% Ethanol instead, and the QWET process. When it reaches that azeotropic stage of evaporation, you can stick the shallow evaporating dish in the freezer to harden the oil clumped together because it is hydrophobic, and pour off/blot most of the water before it freezes. 200 proof reagent grades are available if you are concerned about dealing with 5% water.
Both QWISO and QWET rely on extracting at low enough temperatures that the C-30 through C-55 molecules above our targeted C-10 through C-22, become less soluble, so less of them are extracted.
