Within the experiment you want to shoot GA data off of, have you gone to the integration section and set the custom dimension you're using in GA along with the account name?
In addition, you probably want to create a report in the custom reports section of your GA. It would go something like this:
- Set your metrics (bounce rate, % exit, etc.)
- For dimension drilldowns, do Page > the dimension your experiment is set on
- Filter > include the dimension your experiment is set on (Regex by experiment ID)
