My current silver doesn't like meal worms either. When he was small, I had him exclusively on floating Hikari food sticks, but now that he's in the big boy tank with my other large fish, he's on shrimp and tilapia. I typically stuff a stick of food into his food before feeding. I've done the same thing with my catfish for years.
Sounds like you are going above and beyond though, so just keep doing what you're doing. Eventually, silvers grow into giant beasts that will eat just about anything you present them with. Do you drop the food in the same spot every night? I don't know if it's a good idea or now, but that's what I do. The fish in my tanks know where I'm heading and what it means. When you catch an aro when he's hungry, you could drop in just about anything as the first piece of food and they'll take it. My first silver was so eager he tried to take the food from my hand before I'd dropped it.