Do your large, green yucky worms have little white things all over them? If they do, they have been parasitized by wasps (Braconidae) & you should leave them so the wasps will hatch out. I had one earlier this year - very creepy looking, but I was happy the worm was not damaging my plants any more and a host for the wasps that would take out other hornworms. Here’s a link with decent pics & info:
http://aggie-horticulture.tamu.edu/galveston/beneficials/beneficial-04_braconid_wasp_on_hornworm.htm
I actually feel sorry for those icky worms now....;(