I am also very happily using Dragon Medical 10 for dictating into Amazing Charts.
I second the comments above that the choice of microphone is critical. The USB microphones definitely increase accuracy. Get something better than the mike that comes in the DNS box. I used the Andrea USB-NC1700 for a while, and then the Parrott VXI, both headset mikes with good accuracy, but taking them on and off frequently was inconvenient. I finally (over)paid for the Dictaphone PowerMic II, since it has excellent accuracy and works much like the dictation equipment we are used to, with the "press-to-talk" switch on the handset, and programmable buttons to spell-correct, tab, backspace, etc. It is also very tolerant of moderate background noise.
There are several good
commercial sites that compare microphones with sufficient accuracy and noise cancellation needed for effective dictation.
I wish someone with Amazing Charts would survey DNS users to make DNS work more effectively with AC. It annoys me when I dictate "no" or "in" with a momentary pause that makes DNS think I'm giving a navigation command, and suddenly a menu drops down or the patient weight changes to metric.