You were right. I am going crazy, and nowhere. This could be long.
Thin glyphs where lines touch borders don't mix well with the blocky ones.
Might as well extract a-z from any other font if the thin lines won't reach borders. Then the style suffers.
Hollow triangles made with 1 pixel diagonals and straights instead of filled ones look ghostly.
Scaled down 4x4 filled triangles in a 8x8 grid reduces their weight OK but they obviously won't touch anymore where they should at junction points.
Box-drawing ...well, was meant for boxes.
In the mean time, my unsatisfying suggestions:
#1: reuse the A-Z glyphs for a-z always displaying text in capitals, BLOCK style obliged.
#2: if absolutely need to distinguish lower from capitals, invert A-Z pixels to display a-z.
...Sorry PoP is, so far, a failed font designer.