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You know you can re-define those font sizes and get desired number of lines (as a side-effect of smaller font size) using "FONT_RAMP" file? On any firmware newer than 5.5.x.
With a caveat that FONT_RAMP remapping is in effect only for books in KF8/azw3 format.
All in all your question needs more details: 22 or 23 "lines" with what line spacing, margin, boldness settings? Even with that extra info keep in mind that it will still vary between different book formats and CSS style used (line-height property value).
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