Honestly if you're running 16th notes a slight difference in size/tuning is only discernable if you're REALLY listening for it....listen to Aenima (the song, not the album) - Danny uses two different sized kicks on that song - tuned differently - but you'd be hard pressed to tell....and in terms of bpm it's not even that fast....
For me it's about options....anything I use the 20 on for single kick groove is slow and steady - something I can play with my left foot and still maintain a groove....*when* I up-tempo into sustained triplets on both kicks (or even 16th notes for that matter) - it flows so the differential in tuning is really hard to discern.....
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