You need the L/XL. Doesn't matter if your boots are the lowest profile ones out there. the S/M is a tight fit even with low-pro boots in 8.5/9.0.
16 Gnu Swallow Tail Carver . 16 NS West . 15 NS Snowtrooper BIA
16 Burton Genesis X . 15 Now Drive
16 Flow Talon . 14 Flow Hylite