Something else, perhaps. I don't know your mainsail area, boat performance. Could you get hull speed and point high enough to make the mark on just the main (unreefed)?
Sail plan calls for 198 sq. ft. Dunno about the unreefed main alone in that air. Wouldn't an unreefed main in that kind of air give you one heckuva weather helm? We'll have to try that sometime. Hull speed is 6.7 kts (theoretical, simple equation). As it was: We were occasionally hitting 6 kts, but were down around 4-1/2 to 5 most of the time.
During that same race: Were doing well over 7 kts, a couple of times hitting 8, on a beam reach.
What were similar boats (the ones that were ahead of you, going faster, hint, hint) doing?
Couldn't tell you. We got a late start (see my "The Good, The Bad, and The Ugly" thread in General Discussion).