Brian,
I'm in Northern New Mexico and have to deal with similar buildings. Through bolting when practical is best. Depending on the adobe, sometimes long wood screws or 1/4 lags will hold amazingly well. I use a piece of shallow strut with as many 10" lags as it takes. If they hit a void move over and try again. Never tried epoxy.
Search for my "Today at Work..." post in the Photos Submitted for Discussion Forum for some pictures you can relate to. This was a service change the homeowner got a start on.
Good Luck
