I think that you can experiment with adding more coins. ->
You removed some not very profitable coins, now if there are no new profitable, just add some different coins that may become profitable and are easy on the server to handle and us to mine. I think its better to have alternatives.
I'm all for adding coins, but it comes down to more of a "how much time do you guys want me to spend on new features" vs "how much time do you want me to spend hitting 'trade' manually"?
Definitely not trade manually, better spend time on fixing/upgrading features than testing trading with bad coins.