It's a conundrum. I don't have any way to test the window cover action from here.
I did notice in an earlier thread on this forum that one guy with window coverings was sending the action twice in row. He didn't say why he was doing this. So a few things to try are:
1. We can have it send the action twice in your command by changing the rightmost Command Repeat field from "1" to "2":
<?xml version="1.0" encoding="utf-16"?>
<!--VoxCommando 2.1.0.3-->
<command id="1159" name="Close Shade 1" enabled="true" alwaysOn="False" confirm="False" requiredConfidence="0" loop="False" loopDelay="0" loopMax="0" description="">
<action>
<cmdType>Vera.WinCovAction</cmdType>
<params>
<param>{M:Vera1D.Window Covering 1}</param>
<param>Down</param>
</params>
<cmdRepeat>2</cmdRepeat>
</action>
<phrase>Close Shade 1</phrase>
</command>
If no luck there, we can try sending a Vera.Raw command. Technically, the WinCovAction is just doing that for you behind the scenes so I don't know whether there's any point in trying that, but who knows. First try the above (when you have the time), and we'll take it from there.
Eventually, if we get nowhere, maybe Maestro James will have some thoughts when he's available.