Did I not just list Coan, Hoornstra and co?
There is a guy in the pl forum who made a "600lb raw bench" thread... What's he do? Seated Overhead Press, 315x8 or so after all his other pressing of the day... He reps 600 on the bench, raw...
Where on earth did you get that from ?
He is a strongman competitor, of course he will have to do his event training etc standing...
Again: Almost all the greatest benchers in powerlifting who actually do press overhead, use seated BTN or seated front presses as their main overhead press.
You can do what you want, ultimately, I take it you're on some 5x5 routine. That's fine. But don't make up nonsense here about powerlifters avoiding seated overhead work.
The OP wanted to know about the angle of the seat... On seated presses. So there.