BikeChick, FWIW, I'm making progress on reducing the Achilles problems when I run - not completely there yet - but I've completely eliminated it on the bike by learning not to plantar flex my ankles when I pedal (along with lowering the seat a couple of millimeters at a time as I learn). It's been a long process of changing my biomechanics on the bike, but it's really paid off.

Take it easy and work on myofascial release...