I am wondering what bike fit specialists Seattle has to offer.
Lots of fitters in the area including several on the forum.
Check Triumph Multisport - Tom Price can give you info on getting fit.
http://www.triumph-multisport.com
Also, Ben Bigglestone at Eastside Multisport does fits.
http://www.eastsidemultisport.com/contact_us.html
Erik Moen is recommended quite a bit. If you can get your doctor to write a prescription for one, he takes some insurance. http://www.bikept.com/
I highly recommend Triumph Multisport, not just for fitting, but for all you tri needs. Tom Price is a great guy with TONS of knowledge and is always takes the time to answer your questions.