I would if it was built but it’s sitting in bits in the garage at the minute awaiting a post-winter deep clean and rebuild. The cotic website lists it at 23.8in (centre post to centre head tube). I’ve got 100/120mm Talas forks on it and other than the steeper head angle and and more racy position at 100mm, there’s no noticeable difference in reach between the two in terms of virtual top tube length, probably only a few mm. I honestly think that a medium with a straight seatpost and 50mm stem will fit you. One of my mates who’s shorter than you has tried mine and said it was ok for him. If you’re in any doubt try emailing Paul at cotic as he recommended a medium for me. It sounds odd, but the geometry just seems to work. The numbers suggest it’ll be too big but when you ride it you don’t notice the difference.
Edit: I’ll echo Jon’s comments about sometimes having to haul it round corners. But I’ve always ridden like that so it’s never been a problem for me. Horses for courses I guess. Something with 29in wheels is always going to take a bit more effort to get round corners than smaller framed/wheeled bike.
Edit 2. Before the Solaris I had a small BFe which was ok but a little on the small side for me.