I'm dropping by to give a one line solution to all of exch.cx's problems with monero liquidity and the lack of profit they apparently make despite charging buyers with 5% service fees. Here it goes:

Instead of using bisq's price as the de facto monero price, simply set the price yourselves at whatever you want it to be since you have more (real) volume than any monero exchange on the market, including the centralized exchanges.

Eg: current monero price on bisq is $162, exch.cx sets it's real price at $172. You can also lower buyer's fees by a lot now.