After mapping the grid I like to fine-tune any gates/expanders I'm using within the mix. Any issues with a gate's threshold can be automated, and using the grid can be easily copied across any identical grooves throughout the arrangement. Without the grid mapped this can take ages but once in place this writing of automation can be completed in only minutes. Regardless of the style I still utilise expanders or gates across my Kicks, Snares and Toms. This accentuates the impact of rhythmic instruments adding punch, separation and also removes extraneous noise from your mix buss. As is so often the case it is what we take out, not just what we add.