On Madcap we do really well with a 155 on a drum with a 147 rating. It does not seem to hurt me in light air against other PHRF boats. The 155 credit is 6, and drum is 3 for LMPHRF.
The light Lake Michigian summer winds have seemed to pick up the last couple years. I have found myself wishing I had a #2 or #3 up. I am going to go lose the drum to do sail changes next year and stay with a 155 which puts me at 144 for LMPHRF.