You might try including weights on the eVent jackets before giving up. Especially with the recent BPL tests showing eVent to be quantitatively the best breathable/waterproof fabric on the market, I would expect someone to jump at these jackets at these prices.
ESPECIALLY with your "returns accepted" offer in case things don't fit. That seems incredibly generous. Leave this up for a few days -- someone should take you up on it. (I'm a size M, so that person isn't me.)
Bump for you.