One of my cats did get more mats when she was eating science diet (the Rx kind for their teeth). Now she's on Felidae and no mats, less shedding. This isn't exactly what you are seeing, but just mentioning that I did see a change in matting with diet. No change in hairballs, though, which she coughs up now and then.
For the too fast eating, you might try putting the food in a large tray (baking sheet) to slow the cat down or put something in the food bowl your cat has to work around, such as an overturned smaller bowl. For mine, it helped to switch to a food that required chewing, as opposed to small kibbles that could be swallowed whole. My other cat is a pig!
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