If you don't have a load on the passive crossover, the test results will have errors.
If you don't have the speaker load connected to the HU, your test will have errors (unclear whether or not you had such).
The rear speakers, as have been published elsewhere, have an active high pass filter in the HU.
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To get a flat response without recoding, I had to set the switch on the amplifier to #2 (reduce output to woofer under the seat by 4dB) and set bass=-2 and treble=-5.
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I don't see any screenshot of a flat response. Did you take a screenshot of this "flat" response? I don't see anything you've posted that comes close to what a normalized signal looks like, in my experience.
All in all, you seem to be verifying that the HU response is nasty without recoding or without external normalization.