Pixi Graphics line resolution not sharp on zoom

Hey all, 

I have a PIXI.Graphics line with about 500k points.  Draws fine, I added PIXI-Viewport for zoom and pan.  When I zoom in the line resolution is not good.

2 questions.

Main Question, how to fix the sharpness of the line on zoom-in

Second question, how can I limit the zoom and pan to the min and max of this line I've drawn?

Thanks!