I was planning this same trip last year, but had to abort at the last minute. Everyone told me to leave the 8 at home and bring the 9 & 11 combo for panga fishing.
After much consultation with my beach guide, I was going to bring two-handers of 12' & 14' or 15' for fishing the beach. I was advised that a cast of fifty-yards would give me a much better chance of scoring a rooster from the beach. RB Meiser and his band of merry fly anglers have been using the two-handers for the beach roosters for some time now, so he would be a good resource for you.
Another might be Gary Graham who runs a shore guiding business on the East Cape I believe. I have heard that he has also been messing around with the two-handers down there.
If you had to add one rod to the arsenal for fishing the beach down there, I would urge you to consider a stout two-hander of 12-14' in length. Seeing that you are in Oregon, it shouldn't be too difficult to get your hands on some sticks to evaluate.
Nick Curcione also has a book out called, " Baja on the Fly."