Let me Answer Your Questions:
It is not really true that only 9,5% of coins are staking.

Potcoin has a Blocktime of 40 seconds.
Staking coins for he last 1000 Blocks is 9,5%.
1000Blocks * 40seconds = 11.11 hours
That means 9,5% of coins are staking the last 11,11hours...
So nearly 10% of coins belong to nodes that are connected 24/7
But the most People stake maybe once a week or even less.

So POT is very active.
37,5% Sitting on Bittrex...
That is maybe true but Bittrex has over 90% of POT Trade Volume, so that only means there is enough liquidity on the exchange.

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