S/M will fit, as well as being a bit smaller/lighter. There's plenty of space, but as they mentioned the toeramp at full extension will still leave some overhang. Also, the straps won't be extra long, but not that big of a deal for the trade-off imo. L/XL will be easier (for a beginner) to strap in and give you more extension on the gaspedal. Being stuck in the middle too, I went for the smaller size and am very happy.
16 Capita BSOD . 16 NS West . 15 NS Snowtrooper BIA . 13 Salomon Pow Snake
15 Now Drive . 14 Burton Genesis
14 Flow Hylite