I don’t think there’s any other way to do this, other than to change the dimensions of the map or the board so that the piece fits in the hex.
You can then add a Stack Viewer to the board to magnify (enlarge) the piece when a player holds the mouse over it. When you define the Stack Viewer, you can pick the factor that the image is magnified by (for example, x1, x1.2., x2 or any other factor).
You can also add a Zoom tool to the map to allow players to make the maps as small or as large as you want.
The problem is that I have made the maps to this size and if I desing the pieces to fits in the hex, is very small for the information that I want to show…and if I make more bigger the map to adjust to the piece then the map lost resolution too.
The problem you’re having is that you want to map the piece images at
full size to a scale factor which is not 100%. Presently, this isn’t
supported. I can see the utility of this, however, so its something
which might be supported in the future.