Well the thing is, j.S is a level 2 normal and so it does 13F hitstun on an airborne opponent. On the other hand, j.H has 13Fstartup. So, yeah, mistiming your j.H by even just 1 frame can cause it to black-beat.
http://shoryuken.com/2015/02/13/arc-system-works-reveals-second-round-of-changes-for-guilty-gear-xrd-sign-update-set-to-launch-in-march/
Looks like they didn't increase bite's damage? Oh well, as long as the increased advantage on hit really means something (like if we can link a 2K after it like in AC). And k dandy pile still gets that awful 70℅ forced proration....