I would like to second that caprylic is the smoothest cut I’ve tried. Tried several commercially available terpene diluents, triethyl citrate, mct, etc. But what I find is that stuff cut with caprylic is actually smoother than uncut material, even on the dab rig, at around 10%. With the limited safety information regarding the different diluents, I think the bioassay is about as accurate as we can get at this time.