If your mold has thin appendages that are falling off, the first thing I would do is contact Dead On, and see what they recommend. It may be the worm oil is softening the thin stuff and making it weak.
In the past, when I had that kind of a problem, I'd try a process of elimination to try and figure out what's the problem.
I would start by skipping the worm oil, and see if that helps.
Next, I'd try and use a harder plastisol, to see if that's the problem.
If harder plastisol solves it, but makes the bait's too stiff, I'd dial back on the hardener until I got a soft enough mix that would still hold up.
For me, that process has worked.
Good luck.