Heat 3 tablespoons oil in large nonstick skillet over medium heat.
Add breadcrumbs and half of garlic; sauté until crumbs are golden and crisp, about 10 minutes.
Transfer to medium bowl.
Sprinkle shrimp with salt and pepper.
Heat remaining 5 tablespoons oil in same skillet over medium-high heat.
Add shrimp and remaining garlic to skillet; sauté until shrimp are just opaque in center, about 3 minutes. Stir in 1/4 cup parsley, capers, and lemon peel.
Add cooked pasta and 1/2 cup reserved pasta cooking water.
Mix in 1 cup garlic breadcrumbs, adding more pasta cooking water if dry. Season with salt and pepper.
Sprinkle with remaining garlic breadcrumbs and parsley.