Hi Mark,
Your teeth look amazing - such great progress!!
If you're having problems with your powerchain staining, you may want to try another color. I am in powerchains top & bottom (my treatment is almost done - getting de-braced on April 23rd).
I also have ceramic brackets and hated how my ligs & chains stained from my coffee drinking habit (hey, we all have our vices) because they made my teeth look so tellow, when in actuality they weren't.
I decided to go with silver powerchains at the risk of them looking like a grille. They are actually not very noticable and they help to resist staining.
I know Lynn, the owner of this site, also mentioned getting smoke colored chains. My ortho did not have this as an options, so silver it was. I actually got the silver chain on 3/17 and the same day ate curry without even thinking about how that would stain. The chains turned a subtle sea foam green color, but it faded back to silver after a few brushings - just in time for my business trip to Los Angeles!
I hope everything goes well for you & good luck trying to find chains that work well for you!
Sandista