M_Boats: Weather helm and trim

I have a new, used, M-15 and it seems to have more weather helm than I'm used to or that it needs. Sometimes it's ridiculous. I was thinking I needed a bigger rudder but I probably need to tune things a little better. Maybe I need to reef earlier too. Someone here recently suggested putting the 2nd reef in 20 mph wind. That's about where I've been putting in the first. Is there a procedure for tuning out some of this weather helm? Thanks! Steve M-15 63