display three contigous polygons with boundaries side by side instead of overlapping

[avidbadger]

I'm trying to display contiguous polygons with identical boundaries so the boundaries of each polygon are visible. I've been playing with Offset in symbology to try to accomplish it without luck.

Call them polygons A, B and C.  Polygon A borders B and C and Polygon B borders A and C.

I can get A to line up beside B and C nicely, but the boundary of Polygons B and C either directly overlap and show 1 color or if I change the offset so those two align it creates a gap between Polygons A and B. It's probably easier to see with a screenshot-but it says I don't have permission.

Has anyone run into this issue before and found a work around? I tried digitizing lines of the overlap and symbolizing those uniquely, but at the scale this is being created it looks messy. I'm out of my own iddeas and am open to others or using illustrator (which would be new to me).

Thanks for any help.

[hbontrager_dgco]

Not sure exactly what you have tried, but this is how I would show adjacent polygon borders at the same time. 

1) Offset your polygon border by the negative half of your stroke width. Example: if your border has a width of 6pt, offset by -3pts. 

2) In offset, change your offset options from fast to accurate

3) In caps & joins, change 'join type' to miter