Dave,
Let me tell you my observations of the P19 down here.
There are 2 active teams,...both on st. Thomas,...both the teams had sailed/trained with a former P19 Natl champ, John Holmberg,....the keep the boats full throttle all the time...John Holmberg raced a I-20 for the last 2 years before retiring....
First they put spinnakers on the P19,....which was good,..because it got them OUT OF MY CLASS...:-),....the last 2 years, they took the spinns off,..and put on smyth MX rigs,....the boats are truely TURBO!
In last years Rolex,.....the 2 P19MX teams would race for 70 to 80 minutes courses, only to be seconds away from each other,...quite the battle they had going.
In one race,..this P19MX duo was within 50 seconds of a I-20 w spin , at the finish( we had 2 classes[ spin- nonspin], 1 start).
so, as you say,..yes,...in 12 and over,...the MX is a true wild machine,......which is why I would like to see a Texel rating......( there is none listed in the Texel site..)
Bruce
St. Croix