The P19 is a great boat, and it can be fast in light air. Your skills may be good, but if your competing with teams that are at class miminum weight, if will be hard to keep up, even if it is a Hobie 16.
The crew weight for the P19 is about 300 lbs, if your sailing at 420 lb crew weight, your 17% high(385+300).

In light air I find pinching is slow, foot off a little and keep the boat moving.

Scott