There's a pretty wide gap between Goku & Vegeta and the strongest Boo arc fighters such as Super Boo, SS3 Gotenks, and Ultimate Gohan. Yet, Vegetto is able to casually trounce Boohan around while not using seemingly all of his SS1 power in the manga, he even verbally exclaims he's surprised by how easily he's winning the battle.
I think putting Base Manga Vegetto anywhere between SS3 Goku to SS2, Post-ROSAT Gotenks would be more than enough for an x20-30 increase to let him smash Boohan's shit.