Hey neighbor, I'm in So. SF. The Bay Area split locals are mirrored at 129 so you won't lose those. For a D300 there is no skew, so all you need to worry about is the elevation and azimuth.
I recently moved my dish pointing at 148 to 129 just to get the Voom channels and I like them. The only thing is that the signal strength for 129 is not as high as I would like it to be. For example, for TPs 20 and 21 (our locals) I only get upper 60s and low 70s. For the Voom channels I get mid 80s.
Good luck and come back if you have more questions. Oh and welcome to Satelliteguys.us.