[palosanto]

but as you zoom in, the thickness of the line should be increasing a proper amount to provide consistency when zoomed out and in. 

Only applies to the e-ink version

Mike, the problem is zooming out after annotating while zoomed in.  To test it
Choose a pen size of say, 40 and draw a line
Zoom in to the max (to be more obvious).  So far so good, the line zooms along.
Now draw a line:  The line is much thinner despite not having changed the size from 40.

UPDATE: The same problem happens with stamps