Okay, just read that part again. I am actually using SmartThings but I figured it out. There is a parameter being passed in the z-wave command, within the Device Handler. Problem solved!
For anyone who is interested I created a virtual switch that I am using so I can trigger the preset/midpoint from Alexa, via the "stop" command. With the default at 1s it work most of the time. Setting it to 1.5s it works all the time.