@stgatilov, this is precisely where our views diverge. We're both interested in a narrower, aspect-corrected font, but for different reasons: You're looking to increase the amount of text than can be held... I'm looking to make the backing fieldwidth less wide, and think there's already too much text per subtitle.
A possible compromise would be to make the fieldwidth 2/3rds of the screen. This would maintain the current amount of text, given the current font but now aspect-corrected. Probably more text (ugh) with the Stone font, aspect-corrected.