Sorry, but you're wrong.
I.e., "the distortion of B is four times lower than the distortion of A" would usually be supposed to mean, that the distortion of B equals one fourth (= one quarter or respectively 25 %) of the distortion of A. Whereas "the distortion of B is one quarter lower than the distortion of A" would rather mean, that the distortion of B equals the distortion of A minus one quarter of the distortion of A, hence equalling three quarters (or respectively 75 %) of the distortion of A.
Where it gets more difficult: "The distortion of B is four times higher than the distortion of A." Because that's not quite the same as "the distortion of B is four times as high as the distortion of A". So while the latter would simply mean "distortion of B = 4 x distortion of A", the former might rather mean "distortion of B = distortion of A + 4 x distortion of A = 5 x distortion of A".
I'd agree with you, however, that there's a bit of a "logic break" there - 'cause while "is four times lower than" would equal "is four times as low as", "is four times higher than" might rather not equal "is four times as high as".
Greetings from Munich!
Manfred / lini