At this regard I think it's interesting to share this email from the designer re std bulb keel vs the deeper IRC fin keel :
"The question of keels is an interesting one. If you believe ORC, then the deeper & heavier flat fin IRC keel will have a speed advantage over the lighter but lower VCG standard bulb keel in light air windward/leeward racing. Under IRC, the flat deep keel is given a very nice rating accommodation (slower) and the bulb style is disadvantaged. For me, there is no question that the standard keel is the better keel to have as an owner if you ever sail with fewer crew, want great stability and care about having more reasonable draft, or if you plan to sail offshore with less crew. The fin keel is only offered so that owners who race IRC around the buoys will be able to compete against other boats who have been benefiting from this rating credit for the last few years.
The fin keel probably has the boat for boat speed advantage in light air upwind due to a little less wetted surface and slightly less drag. I would say the crossover will be at 8-10 knots. The fin keel will then require more weight on the rail for the higher wind conditions, cahngin or flattening sails earlier both upwind and on a reach, and always need this in order to match the stability of the standard keel."