Hmmm... as far as I know, the only way to get 1st quality Horween is to buy it in bulk or from Tannery Row. If there's another way, tell me! Basically, from what I've read you can buy it from Tannery Row, Maverick, or Springfield (they don't seem to have anything but 9 oz right now), or you can buy off-cuts from other members or shoe stores. Some people bought pieces from Aurora Shoe Company... you could try that. I know you want to say you use prime quality leather, but a lot of hides from Maverick are probably there because there are some blemishes or scars you can work around. Just because Horween couldn't sell the whole hide as perfect doesn't mean that the piece you're using would be faulty or inferior if you have the staff at Maverick do a good choosing job....
Sorry, not much help. Let me know if you find a supplier.