192 clipping??

I mixed a track the other night and was mastering it in pro tools which I normally do. I know you guys are going to shout at me for this but I was trying to get it as loud as a commercial CD. The strange thing was my 192 was showing the rid LED on the 1-2 output but in Pro Tools none of my meters were clipping?? Not pre or post fader. Also I couldn't hear any clipping. I was using slate FG-X as my final limiter and was pushing between 9-10 RMS on the slate meters and my ceiling was set to -0.1. Do the 192's show clipping just before clipping takes place. On my Allen and Heath qu-16 the clip light comes on a few db's before clipping actually happens. Hopefully someone can shed a little light in the :)