Fill a large pot with water and bring to a boil. Add pasta, season well with salt and stir. Cook pasta until al dente, 7 to 8 minutes. Drain, reserving 1/2 cup pasta water.
Place diced guanciale in a cold pan and place over medium heat. As the fat begins to render, stir bits around until evenly browned and cooked.
Using a slotted spoon, remove guanciale, reserving the grease.
In a small mixing bowl combine eggs, egg yolks, grated cheese, and a generous pinch of black pepper until fully combined.
Whisk together.
Place pan with grease over medium-high heat and add pasta. Toss to evenly coat.
Remove pasta from heat and pour cheesy mixture over pasta and toss together until fully incorporated and sauce begins to form and thicken with the residual heat, 2 to 3 minutes. Stir in 1-2tablespoons pasta water at a time, only as needed, to make the sauce more fluid.
Toss guanciale into pasta until evenly incorporated.
Divide pasta between bowls and top each serving with more freshly ground black pepper and freshly grated Pecorino Romano.