Central Valley shouldn't have any corrosion issues to cause any related problems. How many miles are on your "new" pads since last year?
When you say abnormal wear what is the difference in pad thickness from pad to pad?
New brake pads are usually about 1/2 inch thick for the pad material, NOT including the metal backing plate that the friction material is bonded to.
The xD has semi-floating calipers (one side is fixed the other is not). It is not uncommon for one pad in a caliper to be twice as thick as the other when the pads are at the end of their life (less than 30% of the original material thickness). This can look dramatic when one pad is almost paper thin and the other one seems nearly 3/16 inch thick. It isn't great, but it is "normal" for these types of calipers due to the way one half has an easier job of retracting due to the caliper design. This design weakness shows up mostly on the drivers side because it has the most work to do and therefore wears faster independently of caliper type compared to the right side.
Right side calipers will show some uneven pad wear as well, just not as extreme as the left due to the "easier" job they have.
I have seen nearly 3/16 inch difference between the thinnest and the thickest of the four pads upon replacement several times over the years.
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