Yeah, you're in a tough spot.
Keep in mind that you should have two separate pointing directions. The C5 (we don't have a db5) should be pointed about due south towards La Jolla for 8 & 10. The 91XG should be aimed about 30° eastward towards Mt Miguel.
Take advantage of the 91XG's tilt bracket and boresight down the boom. Adjust the front of the antenna "nose-up" so that boresight is aimed at your visual horizon on heading 139° magnetic. Remember 1) that the 91XG has an extremely narrow beamwidth and will need accurate aiming and 2) the terrain path on your line-of-sight is very rugged and may cause the signal to come in a bit "off" from the predicted path.
About the only thing that can easily be done with the 91XG is add an additional center section (makes it about 11' long!). This will tighten the beam width just a bit and sometimes helps in severe situations.
ADT
Edit: I'm slow and got interrupted.... lol
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