Hey Bad JU JU,
I don't know how similar your Giro helmet is to mine. I have the Giro Eclipse and I ended up with a medium, and wish I had gotten a small...cause everytime I go riding- my helmet always ends up lop-sided on my head, you know tilted slightly.
Someone mentioned "extra pads" ...hmmm, mine did not come with extra pads....can I go into my bike shop and purchase these extra helmet pads? I also have the adjustment thing to the smallest, as far as it will go?
Otherwise, I tend to wear a cap underneath the helment..I know doesn't look the greatest, but- hey, it works for me, and gives me a more snug fit. It annnoys me to have it feeling somewhat loose and sloppy. Anyway...let us know what you end up doing- okay.
~ Teresa ~