I don't see a clear effect, but that's also because dvifont.size / self.FONT_SCALE = 99.6 / 100 on my system. Can I resonably modify them to check that one should actually use 1 and not this ratio?

Also, is it correct that

Hum, looks like this depends on some details of your tex install, in particular I can't repro this anymore "as is" with texlive 2019; OTOH one can still see the issue with

import matplotlib.pyplot as plt
plt.rcParams['text.usetex'] = True
plt.figure().text(.5, .5, r'\LARGE ff\textwon')  # force LARGE font
plt.savefig('/tmp/plot.svg')
plt.show()

but this shows that even setting the size to 1 is not sufficient to fix the problem (even though it does improve the situation).

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