Traditional Italian Sorbetto recipes include a small amount of alcohol in the mixture prior to chilling and just before churning an egg white is whipped to stiff peaks and folded into the mixture. Both provide a better texture and mouthfeel because the addition of alcohol and egg white prevents crystallization. I just posted about the use of glucose in Sorbetto (http://gracessweetlife.com/2012/03/chocolate-caramel-cookie-bars-with-pecan-praline/). After some research I learned that glucose (invert sugar) is used by many professional chefs to prevent crystallization in sorbetto, again providing a better mouthfeel. I plan on trying in my next batch. I always use glucose in caramel making and absolutely notice a difference.
One cause is that the water content is too high. What kind of sorbet are you making? I would recommend cooking down whatever fruit it is with the sugar to reduce the water content.
Also, it helps to add some kind of protein to improve the texture.
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Make sure you cool your mix to almost-freezing before it goes into the machine. Faster freezing = smaller ice crystals.
An ounce of white rum or vodka (not enough to detect by taste) will lower the freezing point and smooth out the finished product.
Also, it helps to add some kind of protein to improve the texture.
Are you using an ice cream machine?