Josh, I make all sorts of sparkle colors too... hand mixing kinda sucks, so I've been talking with some of the manufacturers... I would love the striking amber purple sparkles premade. I'll keep trying.
I use Lock Ness on my hand mixed sparkles, because I like the size of the fleck. Any of them can be used though... I was mixing them slower than I needed to. Abe showed me a high speed trick when I was out there last. Don't be afraid to get the gather smokin hot and mix like crazy! I was amazed at how fast I can move my hands and really get it mixed, if I just get it liquid.