Here is the response I received from the BOE:

The rate you charge depends on two factors. 1) where title to the goods passes to the buyer (usually this is the shipping destination) and 2) whether or not you are "engaged in business" in the area where the goods are shipped. If you are not engaged in business in the particular area where you are shipping, you are only REQUIRED to charge the statewide rate of 7.25%. If you charge everyone 7.75% you will be overcharging some customers, and possibly undercharging others.

You are never wrong to charge your customers THEIR sales tax rate.
Whether or not you are REQUIRED to charge their rate depends on the two
factors I mentioned in my answer to your first question. You might want to
download Publication 105, District Taxes and Delivered Sales, by clicking on
the link below.

http://www.boe.ca.gov/pdf/pub105.pdf


So, I think a "statewide rate of 7.25%" is ok, but check yourself to be sure.