Ctom made a good point about differing densities. I know you're very familiar with the process, but be sure it's shaken very well and you might even shake it more regularly between jigs than you would your other colors if you're getting this problem consistently, particularly if you're not getting glitter evenly dispersed. I use this color frequently on Arky and Swimjig heads anywhere from 1/4-1/2oz with great results. I close the jar and smack it on my palm a few times after pouring 3-4 jigs. I'm sure the compaction from the entry of jig after jig in the jar adds to the already smaller tolerance of layering due to the density, so keeping it fluffed up is more critical with this color than some others. What is equally as important is the consistency in the time it's in the jar and how it's removed to keep the coat as even as you can. Some colors have a pretty wide tolerance for heat and the coating time but this one does not. This color likes to layer up quickly like the opaque colors (white, black, chartreuse, etc.) so it too might have a higher margin of error, and when it does overlayer, you'll lose the translucent quality and it will appear as more of an opaque Dark Watermelon base.
I hope this helps! Let us know if you're still having troubles.