Have you tried a pair of Milkers boots. They're not as high but are made of very soft rubber and fit may odd sized feet perfectly and without any pain that I get from wearing other types of rubber boots. they're only about $20.00 bucks at the Farm Store or TSE. I wanted to get a pair of those nice Lacrosse type knee highs but can't find them up here where I can try them on. I don't sit much when I hunt so they suit me fine but if your going to be on a stand for a long time you better look into something with a little more warmth to them.
GOOD LUCK

GOD BLESS
Charlie Patrick
Eastern Ontario Guided Adventures http://www3.sympatico.ca/chazpat/wildcanada.html