MY screen is 109 DPI. There's nothing to be gained by going to 200%. 109 DPI on a K-1 is 67 inches wide.No one is ever going to look at at print that big of one of my images. 200% is the equivalent of 134inches wide.
So, at 200% you are looking at levels of detail that will not be visible in your final print. Why are you doing that?
It's like a kid with a magnifying glass. The first few days they look at everything under it. But with kids, it wears off.
This is when someone always jumps in and says "I print big, I need all the detail I can get." Please, spare us. People printed big with 12 MP cameras. I'm not buying that you need to pixel peep because you print big. You do need a compelling image however.