Practice a bunch of different styles that require a hi-hat "chick." Swing and latin work perfectly. Do it on different beats. 1, 2, 3, 4, 1+3, 2+4, 1+2, 2+3, etc. Practice different times too. 5/4, 3/4, 6/8, 9/8, etc. Just find some patterns and start repeating. A good book to do some syncopation work, which helps overall independence is the book Syncopation. Check it out.
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