Have not poured with a mold from Bob's (although they look like a quality tool), but have poured a bunch with Del's mold. I think some of the variances in action, at least in the handpoured baits, are due to the settling of the salt in the tail of the lure. I have noticed, regardless of salt ratio (and more is WAY better), that you will usually end up with more salt in the tail portion of the bait. that obviously throws off the ablance, which is not a bad thing.
You can also make any of those baits, and trick worms, wiggle more by running the hook farther down into the worm before exiting to T-rig. Makes the nose and tail wiggle as the bait falls.