You were doing great until this...
After a certain point, all sailboats spill the wind and that is called a roundup..part of the design as well
a roundup is when the main overpowers the genoa, and the rudder is no longer able to compensate, and the boat turns 'round and points up it the wind. Normally this is a farily dramatic happening as the boat is often going to heeled (not keeled) over around 45 deg or more when this happens.
Les was 100% correct that as the boat heels over (too much) it starts to spill the air and looses speed, however this does not happen untill after the boat has first picked up speed, partly as a result of what you posted, partly just because of the additional power available. most boats start to loose efficency around 20 deg of heel, anything more than that performance starts to suffer quite a bit. Many people will also tell you that their boats perform the best around 15 deg of heel, which is an indication that for the given conditions they have the appropriate sail plan aloft, and properly trimmed.
As to the original question, Hunters do not heel anymore than any other boat would of similar design. It depends on which model Hunter you are comareing against what compareabe sized competition. Generally a Hunter and a Catalina of the same size will have similar characteristics as they are usually similarly designed boats, but if you comapre a Hunter to a Island Packet of the same size, one will feel like you are standing on a boat, the other more like you are standing on an island. Drasticly different boat designs, and equally different performance and handleing characteristics.