Need Smaller Pens

I would love to use this app, but the pen weights are totally out of scale. Really bad for technical or architectural drawing. The smallest line weight should be really fine. These lines are too thick. The largest pen sizes are so fat, I would never use them to illustrate. I should add that Im trying to use this app on new iPad pro.

Kobus, J. about Morpholio Trace - Sketch CAD