The phase thing on the drum tracks
One of the best trick. I use it everytime I record a drum.
It works particularly well anytime you need a deep acoustic drum sound especially on the bass drum.
Just after you have recorded your separate drum tracks, use your audio editor to put your drum in phase.
The thing is to delay overhead microphones to synchronize with the bass drum and the snare.
Usually there is a 1 to 3 milliseconds delay to apply to your OH mics.
You won't regret it, when you're done, your sound will never be the same again.
Marcus from Poland