MAME, Street Fighter II, and Joystick problem

I'm using a PS3 Fighting Stick Mini 3 on my PC. It works great for SFIV.

But in MAME on SF2, it's nearly impossible to pull off Hadouken or Dragon Punch (any move involving diagonal). When I go into the controller options through the MAME menus, I can only map the four primary directions, not the diagonals ... could that have anything to do with it? I thought that was odd, considering SF2 used 8 way joysticks but in the MAME settings there are only 4 ways. Is there something special I need to do to set up 8 way joystick working properly?

I'm using the latest .148 MAME.