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There are different designs of tile cutting blade, some are designed to work wet, others dry. Some suit stone more than porcelain. Have you looked at the design of blade you're using to see if there's something more suited to the tiles you're cutting?
I would say a little bit of chipping (shelling) of the edges strikes me as fairly normal. I use a file that's normally used for natural stone to dress edges occasionally.
Airhead
@Trunkie
Does anyone have any tips for dry cutting 20mm porcelain tiles with a diamond blade? I'm trying with a 9" and 5" angle grinder and getting some chipping - marginally less with the 9". It seems to be the trailing edge of the blade pulling material out as it rotates up. Maybe I'm being too fussy but I thought it would chip less than it is.