Are you using your onboard soundcard (hw:0,0)?
If it's an intel hda card, you should also use 3 periods instead of 2. At least on all my hda-intel systems, using 3 periods lets me go below 128 f/p, while using 2 would throw a lot of xruns.
Also, as Jeremy pointed out, you should be rising your priority to at least 70 or more.
Good luck!
--
Federico Galland <federicogalland@gmail.com>
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