This is a bit preliminary, but it seems many hard knockdowns (excluding grabs) are noted as having 18 more advantaged frames in training mode than they should. I first started testing it on Riptor, who has 4 different HKD methods that aren’t grab (sweep, tail flip ender, predator HP and HK), all were 18 frames less advantaged than frame data said they should be. I was about to write an angry post in the Riptor sub-forum when I decided to test other characters’ sweeps, and it seems to apply to everyone, and potentially every hard knockdown.
If this is intentional, I’d like to see the data in training mode updated accordingly. If this is not intentional, please add those extra 18 frames to every HKD. Doesn’t matter much to me either way, though having those 18 extra frames sure would make Riptor oki a lot easier. 
EDIT: There is also the third possibility that I am calculating frame advantage completely wrong, in which case I’d love to be corrected. The way I’ve been doing it is counting the frames between when I start jumping after performing a HKD, until when my opponent first starts jumping after recovering from the HKD.
