It's possible that they look too big for you. Most likely, because the screen has a low resolution that they look even bigger.
If the diagonal is larger than ~6", certainly this is the case.
I'll check if it can in some way affect the street name. If I find, I'll post it later.
Btw, did you tried package from
[Only registered and activated users can see links. ]
?
P.S.
Official explanation for mapfontscale is
mapfontscale = 150; (100/100%) Enlarge /Reduce font size names (streets, villages etc)
And it is recommend to put under
[interface]
resolution_dir = "800_480"
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