Unexpected proportions and distortions in Lc Greek

Zeta & Xi

In this first example, the downward stroke gets too heavy

Part of the issue extends as far as this part of the design space. Not too that the bar at the top of zeta also looks too heavy.

In this same part of the design space a less severe but related set of distortions happens in the letter xi

And back to the starting design space the letter xi is unexpectedly heavy