Have you tried this cut of steak? It's fucking yummy. My recipe follows:
2 pounds of Flat iron steak (Top blade)
Marinade: 1 cup of Worcestershire sauce
1 can of Coca-Cola
1/2 cup of red wine
1 cup of olive oil
1 tablespoon of dijon mustard
2 cloves of diced garlic
1/2 tablespoon of rosemary
1/2 tablespoon of thyme
Mix all ingredients in a mixing bowl, place meat in a gallon sized freezer bag (ziplock) pour the marinade over top, and seal the bag (pressing out air as you go). Marinate in the fridge for 12 hours (turn the bag over every few hours).
Bring the steak to room temperature, pat dry and season with salt and pepper. Grill for 6-8 minutes a side on high heat for med rare steak. Let the steak rest 10 minutes, cut against the grain for best results.