That's indeed a difficult situation to assess,
stealthed - it looks like you did it all just right, but that you got caught-out, somehow.
So, the remaining possibilities are:
(1) X-band. Although improbable, not impossible. Since you have the band turned off, it's unfortunately not possible to rule-out, particularly given the suggestion from
The VEIL Guy's well-traveled knowledge-base. If this is the case, then it's time to re-enable that band.
(2) A "quick pull/trigger" of K- or Ka-band that the Escort missed. If this is the case, there's no true defense...this is a weakness of the device.
(3) VASCAR - which is possible to use even as the patrol vehicle is moving, and going the opposite way. If this is the case, then there's no true defense, short of noting that this is a potential trap area.
(4) K-band lock-out....as there does exist, within proximity, a lock-out, it's possible that his signal could've overlapped with the locked-out signal. My question on this one would be, if you were to drive back to that exact location, to see if your sat-icon is spinning (denoting that you're within your set lock-out radius). If this is the case, you'll need to re-assess your risk-ratio, and either not speed at this particular trap location or, alternatively, disable GPS-filtering when you're speeding in this area, to help you better visualize/resolve potential threats.
Truly sorry that you got nailed - it looks like you did do everything right, and was just caught-out by the circumstance of that particular enforcement scenario. Hopefully, with the post-mortem here, we can insure that you don't see a repeat of this.
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OT:
The wifey drives the WRX because I wanted her to be in a safe car that also has enough power to pull itself out of trouble, if need-be.

Unfortunately, she has to have an automatic, which really puts a cap on the fun factor, combined with the fact that she was adamant in refusing to let me modify her vehicle.
And believe it or not, the Legacy 2.5GT is actually, when compared stock-for-stock, back in 2005, not just a little faster than the WRX.

Certainly, neither vehicles are a match for *today*'s WRX, stock-for-stock, but it's always been the case that a mildly-modified BL/BP-chassis, force-fed 2.5GT, can easily keep up with - if not outright pass - a stock Impreza STi/STI, at least in the straight line.
Besides, this is my "old-man's car." When we shopped for our cars, back in '05, about 6 months before Anna was born, I also took my wife to look at both the Evo IX as well as the STi, both for me. She said "no" to the STi, on the outrageous wing, alone. She said no to the Evo, pointing to the factory front-mount, and saying "no, no, your piece of crap DSM has one of those, you're not getting that car." :lol: Winky's actually my first four-door car, discounting my hand-me-down from my parents, which I had for the first year or so that I was licensed.

I can't safely drive baby-Anna around in my DSM, can I?

This car even has a cat!!!! :lol: