Reading through your post, the other thing I don't think you realize is that liquidity for HBD markets has been quite low. This effects the price our service offers on trades that are outside the liquidity range of the market (because it is too risky for us to do a large trade at the top of book price when that price isn't supported by market liquidity). So if you try to make a single large transaction, our system will offer a worse price. Please use the estimator to check the price for the amount you plan to transact, so you won't be surprised if you are dealing in a low volume asset where the nominal price isn't supported well.