Hi: I picked upsomething from the guys back east you might want to try. The use of coloured kitchen sponges. you get a pack of 6 in various colours for a couple of bucks. Cut them in small pieces to make heads for your flies like airoflies. Any shape will do but you`l have to experiment to get the right size to give you a slight sink .
I make up a bait scent oil I salvage the oil pack from smoked oysters sardines or any other fish product canned in oil. cook some garlick in vegetable oil and add it to a mixture of seafood oils.
Tie on your leader and use a needle to run it through the sponge. Now stick the sponge into your bait oil and sqeeze to soak up some oil. shove it down over the eye of the hook and fish it. let us know how you make out.