Did you guys contact POLO
Bittrex is looking like crap and Yobit has more volume than it
Poloniex kraken okcoin coinbase bitfinex are some good exchanges for this coin
Bittrex is history and doesn't excite me in the slightest but when the devs show a fully working and decent site with development improving I can't see why it won't be added to poloniex in the distant future, it needs to prove its worth though and it is on the right track for sure.
Frankly speaking, listing to bittrex is rather easier than Poloniex, Poloniex just added PASC, they won't list new coin in short time(in one month)