I shoot .357 Trail Boss loads in my Ruger Vaquero with plaited and cast 148 and 158 grain bullets with a taper crimp, and I do not have any un-burnt powder problems.
At the Brian Enos reloading forum https://forums.brianenos.com/forum/4-general-reloading/ They shoot heavier bullets for softer shooting loads and most of these bullets do not have a crimping groove and are taper crimped
My point being you might be better off with 148 or 158 grain bullets and Trail Boss for you lite practice loads. This should stop your un-burnt powder problem or try a heavy crimp on your lighter bullets.
https://www.xtremebullets.com/38-s/48044.htm
Either method should increase the "start pressure" in the cylinder before the barrel gap for a complete powder burn. A revolver is a different animal than a semi-auto pistol and you need to get the pressure up in the "boiler room" (cylinder) and get the powder burning good before the cylinder gap.
Its like tightening up your sphincter muscle for that higher pressure master blaster anal exhale. Your loads you have now are only popcorn farts and you need and some higher pressure wild burrito loads.
Below some .357 Mag lite Cowboy loads for reference with the bullet weights.
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