Nick, a suggestion if I may, consider using finer wire and 8/0 thread (if you aren't already using 8/0) when tying chironomids in mid and smaller sizes. You can also use 8/0 thread in different colors for bodies and mylar or gunmetal flashabou (the narrow stuff) for your chromies, wrapping a doubled up strand over a tapered thread base. With finer materials you can build up a slim but tapered body, better representing the profile of the naturals. For durability coat with brush-able superglue such as LaPage or Elmer's Krazy Glue.