Hey Ron just finished watching the videos( pre top 8 and top 8) and I thort you did pretty good.
I know noticed that you were going for the c.jabx2 [link] c.strong and missing it a bit. I personally think its a lot more beneficial to use c.jabx2 [link] c.short. The link is super easy and comes at the expense of like a jabs worth of damage. The risk reward of c.jabx2 [link] c.strong is not good enough(imo) unless you got it down 100%. Heres the math if your interested:
j.fierce > c.jabx2 > c.strong > fierce headbutt = 291 points of damage
j.fierce > c.jabx2 > c.short > fierce headbutt = 263 points of damage
Also against Gief I like to be more mobile. I think holding downback is not your friend in this matchup. Pretty much staying outside of max sweep range and zoning him with normals and straight rush punch.
just my scrubby two cents if you want them