There are basic rules for drift, based as you say on slurring, etc. Largely it boils down to the fact that after a word is used long enough, it begins to soften and be simplified in actual use, with the written language catching up later if at all. The degree to which this happens varies from word to word. Also, from place to place. For example, Seanchan have to listen closely to understand people from our heroes’ side of the ocean because the language sounds too fast, too hard and clipped. Conversely, our heroes often find Seanchan hard to understand because they speak in what seems a soft, slurring manner with an odd rhythmic quality.
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