My shoe size DID go down a tad - from a 9 Wide at 265 lbs to...an 8 1/2 Medium which I still wear.
I also had trouble back then finding comfortable shoes that were attractive in Wide sizes.
I note that you are almost 6 foot tall, so you may be predestined to have 'longer' feet (although they might go down in 'number' size...who knows???); however, if your foot WIDTH goes down, I bet your footwear choices will increase substantially.
PS - try Zappos.com...