I took the DAT last year, and I don't think the QR section really changed much besides added questions like every year.
Take it from someone who is generally not great at math - the Math Destroyer (and general Destroyer) is nearly all you need to do fantastic on that section. I never in a million years thought I would get a 30, but the Math Destroyer and the Orgoman QR videos in YouTube carried me for that section (specifically the ones with Prof. Blois).
Quite frankly, I think that's all you or anyone else needs based on my own experience. The QC sections in the general Destroyer were enough for the DAT I felt as well.