Pearson vs Whitby
One type of center cockpit boat you have left out of your comments is those with no below decks passage between fore and aft cabins, allowing a much lower hull profile. Examples would be the Dickerson 36 and the HR Rasmus. (I have never been aboard a Rasmus, but believe I am correct.) I feel this design compromise creates much more successful center cockpit boat in the under 40'' range.
Just my two bits.