1. Check your loupe is focussed correctly for your eyesight (if it has diopter adjustment) - check using newsprint or the etch marks on the ground glass. You really always need to check the focus on the ground glass with a loupe. This checks your own eyesight/focussing ability.
2. You could measure the distance from the lensboard to the inside of the ground glass. Then insert a DDS with a darkslide pulled and measure the distance again. The 2 measurements should be within 0.5mm of each (I think!). This checks whether the ground glass is in the correct plane.
3. Look at overall stability of your setup - shutter times are long for LF compared to medium format or 35mm. Lots of scope for shake due to wind etc etc.
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