Time alignment (and thus phase coherencey) can make a MASSIVE difference to your sound. it can be a bit of a painful process, but well worth it. Consider making a really transient noise just before the section of interest is recorded (for example, a stick click or something similar. This will allow you to roughly time align the kit.
For a closer, more exact time alignment go through each piece of the kit hitting it once or twice. Then you need to time align each close mic to the OHs (because they'll be different distances from the mic to the OHs, they're phase shift will be different).
However, if you're going to start getting really anal about things, you'll soon find that this doesn't work: the hihats will hit one OH sooner than the other, as will any piece of kit which isn't exactly in the center of the OHs..
There are 10 types of people...those who understand binary and those who don't
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