There are definitely lots of opinions on diluent ratio and appropriate temperature for mixing terps into distillate.
@FloraplexTerpenes and @TrueTerpenes are on here, and have probably stated where they recommend starting.
40C sounds like a decent place to start.
Are folks actually using these for homogenizing distillate for carts? Not a game I’ve played, but ultra-sound just doesn’t strike me as the correct weapon here.
Actually saw a couple of dual axis centrifuges in a production facility that were used for this task a few weeks back. They got great reviews (they had two!!)