i can see where you're coming from, the way i read manga on mangadex is usually via long strip + fit width, but i know some who don't manga read that way.
i feel like changing the typeface 8 chapters in would feel a bit inconsistent, even if i could excuse it with "this is a new volume, it's separate from the first one", and i kinda despise inconsistency, both as a manga reader and as a (relatively new) translator, so i kinda abstain myself from doing it much.
for the record, i
have tried making the text bold at times, but it at points ends up making the text so wide that it leaves the bubble, which would require making the text smaller and that just goes back to the same issue.
it's kinda hard making text big on a yonkoma type format, but i'll keep your comment in mind, pal