I see, basically every alt-coin on cryptsy is trading for more than the coinmarketcap average. Maybe you should consider modifying the price feeds to have a local offset, such that NBT is worth $1.01 instead of $1, then have a smaller tolerance. This is equivalent to an asymmetric tolerance. It would require a change in both the client and the server and would result in something like a buy wall at $1 and a sell wall at $1.02. This would not require any change to the BTC pool, only the USD pool.
The fundamental issue here is that if NBT had existed when cryptsy started operation it wouldn’t have gotten this bad. But as is, you’re basically attempting to provide an arbitrage gateway for the entire exchange.
I can hard code some changes to the client, but it would break the other pools unless I do some labor intensive wiring out of parameters. I can easily make you a branch of my github specifically for NuRiver NBT/USD though.