Don't know if you are doing this but I set up the stroke style in a second separate style as well.
A shape can have two styles assigned, I use one for a "default line" style, and the second one for the fill. I may have 10 different fill styles but I have just one stroke style for the whole thing that I can change globally on just one style.
You can also easily override the default stroke style by "turning on" the stroke for a fill style. Makes experimenting and changing things a joy instead of a pain.
Put the stroke style assignment in the first pull down of the shape, and the fill in the second. The second one overrides the first.
If the fill style has the "enable outline" unchecked the stroke style is applied. If you turn ON enable outline in the fill style, it OVERRIDES the stroke style.
Plus! You can override BOTH applied styles by checking the "enable outline" directly on the shapes style.
I love this... total control. I get dizzy with the power.

-vern