Sounds like a Sizzler. I worked for the factory in Ohio. That bow "foil" you are talking about was supposed to do exactly what you described -- keep the boat from pitchpoling.
Oh thank God !!!! And all this time I thought it was a bad dream 1

Yes - it was a Sizzler 16 that fit (mast height) between a Hobie 14 and a Hobie 16. A little underpowered, but I can attest the foil worked !
Purchased used in 1974 from Brennan Marine up in Bay City Michigan. Interesting tidbit. Brother-in-law and I went to watch DN class in Caseville in "thumb", and they had moved races to Tawas (across the bay) Decided to take in a February boat show at Brennan's and saw the Sizzler. Bought it the next week. Never did make the drive around to the other side of the bay for the DN races.
Biggest problem I had, was the internal hull foam shrunk and pulled back from the hulls, leaving about 1/4 inch all the way around. Water would run down the tramp post and into the hull, making it heavier and heavier. The stern (narrow) transoms were too high and had no drains. Had to "pop" off the "bottle cap type plugs" on the top of each hull, turn the whole thing over and leave it that way for winter. By spring it was dried out and lighter again! Good times !

I saw somewhere, that they were going to try to market the Sizzler again. Even saw some info on the Sizzler 21 and "Super Sizzler" - but then nothing! About 2 years ago - unless
THAT was the dream!