The big ones are called big mini mites I think.
Fishing them under a float is one of the best ways to fish a mini mite.
The main attractor as far as I'm concerned is the flared end.
When you move the jig the flared end causes the plastic to flutter a little as it settles.
To keep the plastic on the small jig try a drop of super glue.
I would also give a small Case hellgrammite a try.