I don't fish for trout much, but wouldn't hesitate to use a Clouser. Colors would be as suggested to imitate the local forage. However, I'm very selective about the materials I use, particularly for smaller size flies.
Wannafish, the only improvement I can advise on is to use finer textured bucktail. Otherwise you're doing a great job with those.
Don't over look other materials either, such as fox tail. Clousers Foxee series are excellent, and are a great choice for small sizes.
Another option is ostrich herl, which ties an excellent small fly. I like it in black as a leech in the Clouser style. This fly is about 3 inches long. Ostrich can be used sparsely, but IMO, a leech pattern with ostrich herl needs to be tied full, otherwise it slims down in the water way too much, unlike hair.