I have the same problem with the Hawaiian Teal.  The color is beautiful but the finish is ruined by those tiny, dark blue (purple) pellets.  Those pellets might be a part of the tint mixture but they do not dissolve, as you found.  No matter how much I shake the can, the pellets remain.  After painting, if you hit those pellets with sand paper or anything else, they tend to break up and smear, leaving a dark streak.

I tried straining the dope thru a very fine filter.  I can get most of them out but not all.

If you want a similar color, try the Randolph Tampa Green Metallic.  Not quite the same shade but close and no undissolved pellets in it to worry about.

i sprang for an electric paint can shaker a few years back. Solved some problems. But probably not yours.