My calculation suggests that I get 39% with AQs against a SB range including AQo+, AJs+ and 99+. So I'm fine with it.
But you might be right that he does 'never' have AJs.
Against AQ+, TT+ it is 35%.
AK, JJ+ drops to 32%
Actual hands turned out to be AKo for SB, while the CO open-folded his AKs for my lulz, preventing my triple-up
In hindsight, I always overestimate live players adapting to late position or blind-vs-blind play.
4bet is still a 4bet to most of them, regardless of the positions. The CO disposing of his AKs is just another confirmation of this.