How long did your glass stay in the 1300's?  That's the dreaded divit zone....too much time there will cause divit (gritty/dull, just plain ugly).  You can probably still salvage these cabs providing any dichroic glass has a clear cap.  Etch them, spray with an anit-divit spray, then fire polish them.  

Another possibility is that the glass wasn't squeaky clean when you put it in the kiln.  I'm guessing that it's divit, but dirty glass can cause a haze that sometimes feels slightly rough. 

Hope this helps!!