That's really odd Chris.
I ran Matsui Silver last month. Got a quart sample from Nick at Ryonet. Printed the silver with no modification through a 180LX and a second color - I added 10% violet to Matsui silver - with flashing in between also through a 180LX. The image was also indexed at 150 dpi.
No issues with opacity, clearing the screen, or washability. It looks just as good after 10 washes (well, almost as good
).
I will try and post a pic...