For what it's worth, I'm a similar height and inside leg to you... and I wouldn't dream of a 50cm. I hope you can get comfortable with your setting adjustments as I think 46cm is the right size.
Move the saddle as far back on the rails as the indicator marks will allow you to, if you've not done already.
Regarding your front suspension, max of 110psi sounds low... but it could be fork dependent. Your fork should have a small rubber band on it. Put that all the way to the bottom and do a bit of a rough ride, check where it moves to and then add or remove air depending on the amount of travel the rubber band shows you've used.