According to the Japanese wiki, they say it looks like it starts from the 4th frame now, and it doesn't GP low anymore
That's probably why you were getting hit. 5D has been nerfed pretty damn hard. IMO, your best Drives to use are probably 6D on reaction, and 2D on obvious jump ins (don't take chances, only if they use all of their aerial options). Though jD seems to have improved.