Fonts bolder in Lion

Wondering if anyone can suggest anything for an issue I'm having, which is that fonts embedded with @font-face look quite a bit bolder in Safari running on OSX.7 (Lion) than they do on OSX.6 or 5. I believe it also happens with other browsers on OSX.7, so it seems it's a system issue, but it's difficult for me to troubleshoot as I don't have OSX.7 They actually look like they are being false-bolded or smeared, but it's not an issue with the browser not picking up the bold font correctly as it happens with text in a regular weight. I've tried different font formats but the problem is still there.

thanks