I’ve done graph layout more than a few times 
, so send me your spreadsheet & I’ll take a look. I assume your algorithm just takes actual min & max and amount of display space (ydim), and returns a list of major/minor ticks with they Y coords?
It’s always an aesthetic choice; there’s no one right answer. Personally I prefer leaving a bit of a gap if it gives more easily readable ticks - I’m a Tufte guy.
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