This is how I move my plastic and salt mixture, 50/50 mix is the max for this unit. I use only rock salt which is one of the clearest and densest type of salts available. As you can see there is no settling with this method.
https://www.facebook.com/thomas.kail.7/videos/10205873303891429/?l=4506783653748150337
To be frank....making an accurate weighted bait is a bitch. Its all a trade off when using different materials to make a weighted bait (rock salt, flake salt, evaporated salt and blasting media) and each and every one has a draw back somewhere in the process. Another big issue with salt is its tenacious appetite for moisture compounded by operator errors. Big tip...when using salt, add it to your plastic in the beginning, allowing any moisture to cook off BEFORE your plastic kicks. If you add salt to late in the process it will cause numerous issues that could be avoided.