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Expensive route: Buy some nut files from stewmac and you can tune the slots to the strings you have. Be careful, it's easy to change the depth and then you'll have to make a new one.
Cheap route: Get some very fine sandpaper from your local hardware store (like the 800 or more grit wet/dry stuff) and take a small piece, fold it, and run it through the slot once or twice. The fold creates outward pressure and if you don't push down you'll sand the sides just a bit without affecting the bottom.
Equally cheap but more cumbersome: Take it to someone and they will do one of the above.
Then lube as recommended earlier. This is a really fairly easy optimization and will be critical if you ever go up in size on your strings. Just my opinion, but these are good things to learn when you play. Saves you lots of time and money in the long run (mainly time).
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