David - I have had a Pahi 31 on West Coast
since 1992. I have been caught in heavy weather as you would expect here. Luckily never for too long. However I have been very happy with the performance. I can carry some small sail and heave-to without losing ground in surprisingly heavy conditions. With the helm
lashed I can point up to meet the waves in comfort. The true course would be a slow square drift or a little better.
The one thing was that I had the old original beams which balanced on central bolts I found this arrangement useless in heavy seas. And make SURE the forward hatches cannot come loose and that you can pump the forward lockers without going forward or opening them by fitting a section of hose or similar in the w/tight bulkhead to use a pump from the cabin
The info. on this site Wharram Builders and Friends - A Photo & Discussion Forum for Wharram Design Enthusiasts
I find better than the "official" site. Check out the Small Pahi Group.