Good question.... I was running in Minimized OS with WASAPI disabled under z8e for the better part of a year, where the scripts worked. 

I just tried 1.186a this weekend, and ended up returning to Normal OS and then let 1.186a minimize the OS again.  The scripts did not work at this point, as the dependent services are now set to a startup type of "disabled" instead of "manual".  If I re-enable (i.e. set those services to "manual"), the script works again, but it would need to be tweaked to turn off the extra service that is started.

On my machine, setting the startup type for the following services to "manual" is required for the scripts to work: "Multimedia Class Scheduler", "Windows Audio", and "Windows Audio Endpoint Builder".

The start batch file does not require a change.
The stop batch file, however would now be:

2 - Stop Windows Audio.bat
@net stop "Windows Audio"
@net stop "Windows Audio Endpoint Builder"
@net stop "Multimedia Class Scheduler"

I ended up writing two old-school batch files for a similar purpose, albeit a lower-fidelity one (listening to rdio).  When I'm done with XXHE and I want to stream, I run "Start Windows Audio".  When I want to go back to XXHE (without a reboot) I run "Stop Windows Audio".  This is easier than digging through the services control panel.

The commands in both batch files are listed below:

1 - Start Windows Audio.bat
@net start "Windows Audio"

2 - Stop Windows Audio.bat
@net stop "Windows Audio"
@net stop "Windows Audio Endpoint Builder"

These work for me under W7 64 Pro.  Starting the "Windows Audio" service in #1 also starts the "Endpoint Builder" automatically. See attached files to save some typing.

Try setting an SFS size that allows you to use 'Straight Contiguous'.... you may end up with a size that's much lower than you are currently showing in your signature.  I find that using the Mixed modes muddies things "significantly".

Have you've noticed a difference between 44.1k- and 48k-based playback?

Chris