Does anyone use a GF Pro Force full face helmet? It looks pretty aerodynamic compared to the standard 3/4 mushroom cap. My HJC has vents on top that become a headroom issue as well as being quite wide with the sides hitting the roof where it slopes to the door, on hard corners.

 

Could you post a link to a pic? I've used a couple at the track days that I rented but don't know what they were so I'd have to see what the one you're talking about looks like.

 

No expierence with the GF Pro, but you might try OMP or Sparco. They both make helmets designed for touring cars (no crazy vents) as well as offering different shell sizes.