What you're looking for doesn't exist. All of the larger helmets sit high. Actually, bike helmets in general sit high. This might contribute somewhat to my belief that bike helmets are of minimal use, as they don't protect the areas that really need protecting.
- so says the guy with the 8 1/8 head. I scoff at your 7 3/4. You can actually find a mass-produced hat that will fit you. I cannot.
The only suggestion I have is to possibly look into multi-sport helmets if you want more coverage.