My favorite is the creme scrounger. I've pretty much replaced my shakys and gone all swing heads though. I'll stick some adhesive backed foam around the shank of the hook or stick a whole tooth pick long ways in the end of the tail for extra buoyancy. Works for me.never tank tested but in clear lakes I've experimented and they stand straight up.
I like that toothpick idea ,,,,,,, first I have ever heard of it ,,,,,,,, great idea.
I experimented with trying to syringe air into the tails but that didn't work out to well and I got real funny looks buying the syringes and needles.
I am going to try the toothpick in one end with a worm weight pegged with a nail on the other end with a wacky hook in the middle.
that should let the worm stand straight up and down and wiggle with the wave action or when I jiggle my rod tip.
headed to the swimming pool now