I agree with @Belassi.
Years ago I made anhydrous whipped body butters and I tried cooling quickly as opposed to slow cooling and never experienced graininess, nor fat blooms. These were small batches though (about 500 grams).
Make sure that the mixture is completely clear when it’s heated, so that every fatty component is fully melted and then cool quickly and keep stirring.
I put it in the freezer for a few minutes, stir, few minutes freezer, stir etc. and eventually whipping (when it becomes cloudy).
Whipping can be quite lucrative as the volume increases drastically!
For the pictures below I made a butter with 77,3% shea butter, 10% argan oil, 10% jojoba oil, 2.5% behenyl alcohol, 0.2% tocopherol.

Grainy shea butter

Not clear yet



Without piping

And with.
I know it’s not the greatest result as this was my first attempt piping body butter.
????
And I had chosen the wrong tip:

Hopefully I could be a bit of help.
Good luck!