I put in a new set of NGK TR55 V-Powers gapped at .055" to replace the set of the same plugs I put in two years ago. The center electrode had worn down so that my gap was AT LEAST .1", more than twice what they were originally... I got both these sets pre-gapped from ZZP.

Is this typical of V-powers? Is this an indication of anything that is going on in my combustion process?

I wonder if you aren't running to lean at top end, causing excessive heat..burning out your plugs?
Do u pull much KR top end?
Just a thought..

0 to 4 degrees, typically.

what color were the electrodes?

Golden brown. The rear three were a little lighter. The front passenger plug (#1?) had some yellow spots on the ceramic around the electrode. The rest looked fine.