There is no Inter 19-ft boat. The Nacra 6.O na is correctly rated faster than my P-19 stock, but all that means is that a 6.O guy can beat me boat for boat, by a little, and still correct out to second place. I know I'm rated 14.6 seconds/hour faster than a Nacra 5.8 original, meaning that if I beat him by 15 seconds in a one-hour race, I win; if I only beat him by 14 seconds, he wins. P-19 pinhead is rated boat-for-boat identical to the Nacra 5.8na, but cannot point as well due to the centreboards. The solution is to sail farther, faster. The P-19 mx is rated a hair slower than the Nacra 6.O original, so finishing at the same time or a few seconds behind would 'correct out' to win.
Anyway, read the tables. The numbers fof the older, less "sexy" boats like P-19 and Nacra Anything "original" are easier to hit by a decent sailor than are those for the hot classes like Inter 20, Hobie 20, and to a somewhat lesser extent Nacra 6.O.
sail fast