From what I have read BattStatt isn't really reliable and pulls more battery from device to use... The software estimates percentage by scanning battery state change constantly and this causes a quicker battery drain.
You can't get more accurate that 10% intervals with the Droid X. I doubt that BattStatt causes battery drain. I get 32+ hours out of my Droid X with moderate usage using DarkSlide 4.2 and I use the default widget.