I haven't reached UVHM with any character, let alone Overpower Levels, but I'm curious to know what aspects of a Vault Hunter scale with OP levels.

I know that gear and enemies will scale accordingly, but it seems that Action Skills scale to OP levels—for example, I've seen screenshots showing Zer0 Decepti0n decoys and Deathtrap appearing as level 80 when invoked with OP8 characters. However, what other aspects of Vault Hunters scale in a similar fashion?

For example, Krieg has a hidden damage bonus (at 1.6% per level minus 20%) when attacking with his buzz axe which depends on his level. Is this damage bonus calculated as if the Psycho were 80th level if he's at OP8? (If the melee damage is calculated using level 80, the damage bonus would be 108%, exceeding that of the unique Law pistol. If not, the bonus is 95.2%.)