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When I used to make jointed swimbaits, I found that the key to keeping them stable at higher retrieve speeds was to make the body taper from top to bottom, creating a V cross section. In my case, my swimbaits tapered from 7/8" at the top/back to 5/8" at the bottom/belly. This kept more buoyancy higher in the lure body, so I could put less ballast into the belly and still get the stable retrieve at higher speeds. I actually started the taper about a third of the way down from the shoulders of the bait, as you can see in this picture" It doesn't look like much, but it worked, so I could burn my swimbaits without them rolling.

Temp & speeds are pretty crucial when shooting plastics. Heat it to 350 & shoot quick. Like said above heat the injector if it's cold. I mix in colorant & flake most times before heating unless i'm making a totally new color that i haven't figured out the mixture yet. This way i prepare the mix, heat to 350 & inject like a well-oiled machine more or less & seldom have any problems at all. The more you do it the more you'll get your system worked out & the problems pretty much become a non issue.