I, too, find that printables generally scan worse than branded. Like cheaper media, I generally burn printables at or below rated burn speeds.
It's always been the case, since printables were introduced. I'm pretty sure it's related to the weight and coating causing balance issues. The best printables I've ever used for quality were the Maxell MXLRG02 4x's. Those scanned almost exactly the same as the branded ones. The 8x are still consistent with the branded, but have fallen out of favor with me because of total PIF's are always pretty high.
Stick with MCC and TY, they've served me right for the past year. I burn dance instruction/recital videos, and never had any returns (after 300+).