Some flake bleeds more than others. You shouldn't have any bleed with the first flake application if you add it to the heated plastic. It will usually bleed on the reheat. I find if I reheat at a power level 6 setting then the flake won't get hot enough to bleed and the bait colors remain consistent.
I don't use pouring pots, only Pyrex in microwaves so i can't help with that kind of application.
Your bad bleeders are emerald, purple, orange, gold, teal blue.
you can manipulate the flake to bleed to get original colors as well. Some produce a nice effect.
Using different sizes of the same color flake produce nice effects as well. try using .025 and .040 blue in your black and blue senko and compare them to just the one size and you will see what I mean.
Dave V