I've been using HOS in GGXXAC+ for well over 2 years, but my friend, who taught me how to play GG, still beats me like I'm a noob. His analysis of my fighting style is that both of my offensive and defensive strategy are lackluster. In terms of offensive strategy I seem to lack pressure and variation so he can do whatever he wants. The only things he fears are my corner HS>D combo from my grab, JHS, anti-air JP, and Fafnir. When I try to defend I can't determine when to act and I often times resort to risky moves like grab or SV on reversal because I don't know what else to do. The only things I'm good at are techniques like GB crossups, and various combos. Thing is though HOS's attack reach is limited which also limits my opportunity to make a situation to do any of these.
Oddly, I do come close to beating him often times, but if he regains his turn I suddenly become unable to recover from his attacks and end up losing. To make this worse it doesn't matter which character he uses. I lose 90 percent of the time with any match-up against him.