I'm aware; but I have seen much larger jumps remain consistent and not outliers. While at the same time, it's also possible for smaller jumps than that to be outliers.
Think this might be a decent place too look at.
And moreover, looking into it myself,
most of the "9-A" stuff aren't even properly calculated and seem to be guesswork heavy. There are quite a few feats that appear Wall level albeit are extremely casual such as snapping large tables in half like pencils or smashing through metal doors without breaking a sweat; breaking out of handcuffs as if they were wet paper. But also causing large scale shockwaves that appear to be like Earthquakes and causing large buildings to become unstable. And there's other stuff that consistently look like they'd be much higher than Tier 9 that appear fairly casual.
Unless there are good arguments to argue consistent anti-feats, 7-C doesn't sound like anything that would really be contested as something some of these characters wouldn't be capable of.