I am having the opposite problem - most of my line widths are set to 1.0mm(ISO).
The solid lines look fine, but the dotted lines have their dots so far apart as to be hard to even see they are there, let alone where they go.
What is strange is that the lines initially looked fine when I drew them, and then suddenly changed the dot size / spacing. The dotted lines went to the larger spacing and the dash and dash-dot lines also became hard to recognize.
I have the drawing size set to "US Letter" in portrait orientation, and each line type is on it's own layer.
I have tried playing with the line properties, and found that going with the small variants on each type helped, and so did going to a thinner line size, but I'd really like to use a thicker line on the drawing. Is there any way to adjust the dot / dash size and spacing without changing the line size?