Design 1 is too much like a patient heartbeat - I subsequently added a comment that I believe you took into account with # 3. I don't care for the grey color - also am not really getting what the graphic is about. However, of the three, this one is getting closer to where I want to be. Thanks for your input!
A friend of mine looked at the designs and immediately liked number one best. He saw the chart as a monitor, not a heartbeat. Also liked the three colors for readability. Hmmm,,,, good observations. Could you perhaps rework this one so that the graphic looks less like a hearbeat, keep the dropped x on Rx and let me look at it again? Also, change out the grey color when you redo this.