if you're in the market for something slightly bigger, I've found this font to be useful on lowish-res (640x480) displays: https://github.com/josuah/miniwi
The size of the characters in pixels is not given in their readme, nor could I find it easily in the config files. Can you tell me how big the characters in its readme are?
The lowercase "s" is only 4 px tall. The "f" and "y" add 2 px above and below, so the total reserved height must be 8px. Then 2 more px for whitespace, so 10.
Weird that the lowercase letters with ascenders are taller than normal uppercase, I didn't notice that. But yeah, the core numbers+uppercase box is 3x5 (with only "Q" violating that). And it's all on a 4x8 grid.