Welcome aboard Nathan.
Guys here using the Essential plastic [it comes only in the medium formula] and the HD sinking additive found here are finding a finished plastic quite a bit softer than a straight plastic with salt that is really close to the original Senko plastic's feel. Way more durable too. The HD is less abrasive than salt and sand to the injector cylinder, seals and plunger parts....just a thought. The Essential is unbelievably elastic making it one of the most durable plastics around.
The soft formula Crystal Clear will give you a nice bait too but the plastic is a bit more temperamental to use if you are just getting started.
Again, welcome aboard