Okay so gonna make this simple:
Main cast scales to this Post Haven (End of Volume 5 to Volume 6) as the former was performed by
Ruby tackling the Atlesian Colossus and the latter is the durability of the Colossus which cast themselves downscale from, they do not scale to Low 7-C in anything but max aura durability, only 8-A in AP. The Low 7-C scales to the Colossus.
This scales solely to Oscar and Ozpin's magic and barriers and would be 'At least' as this was not the maximum amount of energy he could have produced
This scales to the AP and Lifting strength of the main cast for Volumes 7-8 as Penny's feat was performed in her base without Maiden powers and by this point members of the main cast downscale from the Maidens directly as the are
able to fight on par with them to a minor extent
This scales to the maximum aura durability for the cast scaling from Vine, whose semblance allows him to extend his aura, with
his aura being able to contain this blast despite his body being destroyed, but needs to be discussed what end to use.
And this scales to the main cast's speed post-Haven and pro-huntsmen from the beginning of the series