Allright, I finally got to the dealer yesterday. They took all four wheels and calipers off. They took out the micrometer (runout gauge, I assume) and found a couple of high spots on my right front rotor, so they zoomed in on that area of the brakes. After looking closely they came back with this explanation. They HNIC and the top mechanic say that the caliper bridge had corrosion in it and that that was the likely culprit. They say that it was likely preventing the caliper and hence the pad to fully open, keeping the pad in light contact with the rotor. So, after 4 hours at the dealer they cleaned the bridge and smoothed out the high spots in the rotor and sent me on my way. All for 65 bucks. Hopefully, this cures my problem. Fortunately, the warping or DTV or whatever it might be happens pretty quickly, so I'll know right away if that was the problem. Wish me luck.
Thanks for all the input from everyone. That is the reason this is the best WRX site going.