nomis5 - 8:27 pm on Jan 22, 2013 (gmt 0)
Why the change to responsive design at the same time as the move to Wordpress?
Two such major changes at the same time will confuse your analysis post conversion won't it? Did Wordpress cause the gain / loss or was it the responsive design change? You will never know.
Make one of the major changes, wait six months and if all is OK go for the second major change - that would be my advice.
I hope you aren't relying on some all singing, dancing Wordpress plugin to convert your standard site to a mobile one.