Took a lot of testing... I have found that, unlike fiber, a lot of the different colors are not that far off from each other... One other tidbit that is extremely helpful for both diode and fiber when doing tumblers and that is the product BLŪ that literally melts the residue off and brings a shine to the metal...

Man you're nailing it with the diode that's legit impressive. I've never gotten a tumbler even close to this clean with diode before.