One can use an assymetric like a symetric spin. Helps a bit downwind. My boat is a post fastnet half ton. It does ok with an AS, but frankly, a symetric would be better. I will pole the tack to the opposite side of the main at times. this does help me get better downwind angles.
If you want a fun race near you, third weekend in April is the Meydenbauer bay yacht club spring regatta. In the past couple of years, there has been an R23 or two from Renton sailing doing the NFS division as have I. HERE
is a link to the website and info. There are also usually one or two FS divisions also. If you have not raced too much, want to try it out, the NFS ie "no flying sails" is usually the better one to try initially. Then graduate later into the FS or spin groups.