Arguably dynamics are in the same category of importance as are timing and skill for soulful drumming. Dynamics give the beat a topographical groove in which to maneuver. Playing at the correct volume creates anticipation, excitement, and interest.  Without dynamics, it's monotone. Monotone = headaches.

The point here is to practice your dynamics as a regular part of your daily routine. Especially pianissimo; Very soft. WHY?

Playing loud is not a general problem for most drummers. It's fairly easy to swing away with arms and all. The other end of the spectrum is pianissimo, which is a bit more of a challenge. It's one reason why jazz is tricky. Playing soft requires more finesse and control. Wrists and fingers take the lead while the arms are basically loose noodles. Developing facility with fingers takes time and hard work. The results are worth it.  

Being able to play grooves soft as a whisper will also give you a new perspective on phrasing, note lengths, time, feel. And your dynamic range will be that much wider for the efforts.

So, practice pianissimo. My PP practice today were some hypno-grooves out of WORLD RHYTHMS...had a blast!