Well, u know about Dana Point, not a problem if u r under 28ft in getting a slip, above that it takes 6 months or so. No problem living aboard either, pay the Live aboard tax, they are pretty reasonable. I would also try Alamitos Bay and LONG BEACH. LB has is option rich if you look hard and keep your boat up. You would have no problem in MDR either.
I have found the key to liveaboard is upkeep of the boat and your self. if you look sketchy and your boat is a mess than the guy parking his weekend getaway down the dock is going to complain. Low profile, smile, extend a warm hand and you will not have problem.
Dana Point California and the Soggy Dollar Jost Van Dyke