Do you have a look at -webkit-font-smoothing? I regularly use Google Fonts and @ font-face kits and have been successful with some of the โchunkierโ fonts using sub-pixel anti-aliasing and anti-aliasing:
-webkit-font-smoothing: subpixel-antialiased; -webkit-font-smoothing: antialiased;
Perhaps try each one and see if what you see has changed?
There is a post on MaxVoltar that gives a reasonable explanation:
http://maxvoltar.com/archive/-webkit-font-smoothing
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