Affinity Designer Geometry Rescale Issues

[Elluvon]

Howdy. I've been doing some random historic doodles recently for alt-history projects and one of said projects was making a fictional military rank chart. I realized too late, however, that my document was much too small and I needed to rescale it. When I attempted to resample the document from 1280x720 to 3420x2160, I had an issue with the lapels losing much of their upper bevel. 

Here was the document before I resized it.

After resizing, the bevels appear much flatter. Any way to "lock" geometry or some other similar function so that this doesn't occur? 

[firstdefence]

Using the rectangle tools option to round of the corners will maintain it's curve see example below. Setting the rectangle like so will allow scaling without losing the curve due to the curve being set to 50%