Re: 17' - 25' Swing / Lifting Keel Boat (again)
Bene 23.5 is an excellent choice. Moore 24 is very popular in your area, tho it has the same launching issues as the J/24. There might be something in the S2 lineup for you: the 6.9 has a drop keel and rates around PHRF 200.
Don't know what their rates are like, but Marina Del Rey has mast-up storage with an on-site host. Ramps are about 50yds away.
Albin Ballad 30, Fionn