Support service: you changed the original Pixel4x4 in the meantime (which might let us see your latest improvements made on the beginning of july 2017).

You see:

1. Pixel4x4 is more compact than Pixel4x5, esp. thanks to the narrower lowercase in the former (newer) font;

2. Pixel4x4 can be turned into monospace at any time (it's just a matter of styling, provided the designer only used what I called 'safe' grids - that is, without ambigous empty columns, vs the 'rough'/risky grids that blindly add duplicates when they are displayed with a variable width, just because it's a not advised to encode information in empty cell columns, or faint horizontal moves).

End of comment for now.