Tracking the RGB lines back from the edge I found they go thru a 1k resistor array for termination.
The blurry picture looked like when an RGB mod has poor termination.
I socketed the array area and tried out some different value arrays.
The closer to 75r the better, I couldn't find any so just used a 100r array, the picture is emulator sharp now.
original 1k array on the left, 100r array on the right.



