“5′ 10″ and super happy on the large with a 35mm stem. I run fairly narrow bars (760mm) which I think makes it seem shorter.”
I’ve noticed this with my bikes – my local trails preclude really wide bars from working but narrower bars made my medium frame feel too small. Going up a size those narrower bars worked great.
One other thing I found with sizing is that going from a 35 to 50mm stem made a bike that felt too big feel right! I know, it seems to make no sense because you’re moving the bars further away – but I think the longer stem stabilises the steering as you weight the bars, which gave me the confidence to move my weight forwards, which meant the bars weren’t so much of a stretch.