Re: Give the gold to Silva
League average HR/FB is around 10.5% Silva career average is 11.1%. The trick is that he just doesn't allow as many FB as most. That HR/FB rate is what we'll see increase in GABP. FWIW, in his disaster season last year (5.94 ERA) his HR/FB spike to 16.1% and his GB/FB ratio dipped to a career low 1.28. He allowed more FB than usual, and more HR on those FB which he allowed. His 2006 likely wasn't due just to bad luck. He got legitimately hit harder - I have no idea why.
Games are won on run differential -- scoring more than your opponent. Runs are runs, scored or prevented they all count the same. Worry about scoring more and allowing fewer, not which positions contribute to which side of the equation or how "consistent" you are at your current level of performance.