Sorry but I didn’t quite understand. I did follow that tutorial to build my font, but I didn’t find anything in the tutorial talking about the rendering issues.
Or do you mean it’s only crisp in specific sizes? Can I decide these sizes by myself?
What the renderers do may be a different thing altogether, because they also take assumed and actual ppi and resolution scalings into account. It depends on where and which way you use it: the renderer needs to be able to apply the pixels 1:1 onto the actual device pixels.