Need a little help please.

I'm begining to wonder if I am a genetic freak. For the life of me I cannot get my traps to grow. Every other muscle is growing but my damn traps. What gives?

Would someone please be so kind as to give me some pointers and/or workout routines specifically designed for rapid growth on traps.

My current routine includes the following and are performed on Back days 2 times a week:

5x10 dead lift
5x10 front shruggs
5x10 back shruggs
5x10 dumbell shruggs

I've tried 3 or 4 weeks of heavy weight low reps and I've tried 3 or 4 weeks light weight high reps....Hell...I've even tried splitting both heavy and light for 3 weeks or longer with mininal results.