I have had two planing cats designed by Ron Given. The PT and the Tiger Shark.
While sailing my 14sq I often arrive at a place where the boat simply does not want to go faster. The hull is trying to go bow down and displacing a lt of water. (on my 14 foot PT up wind this was never the case. it simply kept going faster until it ran out of puff. It was also much more settled.
The Tiger Shark gave me several rides on a tight reach that were stunning. Steady. planing motor boat like feeling. Took it up to full speed and then wanted more.