less then 2 hours is NOT a very long round and with 157 shares in that less than 2 hours it should be higher given the .21733124 transaction fees added to the 25 for the block.
I have a similar issue regarding a few blocks, since the DDoS ' recovery ' I have managed to get a GPU ( getting out of CPU mining ) ...
Now is probably a good time to 'get out of CPU mining' - but the figures you are quoting look like CPU figures not GPU - you should be seeing better shares/round than what you are posting... what GPU did you get?