If you put your dimensions into the Scott size finder it says a 52, with a 93mm stem, which should produce the intended relaxed fit.

Frame size numbers or letters just don't mean much these days. All you need is stack and reach, plus the seat tube angle to be certain that there's no seatpost setback problem. I've seen models with a steep STA and only 15mm of setback on a proprietary seatpost.

I build-up all of my bikes so test rides aren't possible, but I do know what geometry I need.