I know post is from last May, but I have had some luck with swirling with MP. I think that you are pouring at too high of a temperature. Try to pour much cooler, say about 125-128 degrees.
If you are pouring into a cube you can pour both colors from separate corners this way. I like to pour layers and swirl. I pour in one color and wait a couple of minutes and then pour the next colour on top of that and run a chopstick or spoon through to the next color. AM has some great videos doing this.
I wish you the best!
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