Yea, there’s no easy way to just affect a single ‘increment’ amount. Take a look around line 1325- that’s where the font size is calculated:
$font_size_array[$keyword] = round($font_smallest + (($count - 1)/$font_step));
$font_smallest is whatever you set as the smallest font size- default is 10.
$count I THINK refers to the number of articles a given keyword appears in.
$font_step is the increment - I’m not going to get into how it’s calculated as it’s pretty much a constant and you can figure it out from the code.
So…. Basically the way I see to change things is to play with $count in some way- so that the increments end up non-linear. Maybe use the log or something- don’t know, as I suck with math. But the php is easy if you had the math- just change the formula as needed. Anyway, it’s not a constant, so seems the easiest thing to play with.
Wouldn’t change a given increment, but could change the overall pattern. Hm- don’t know if that made any sense, but hopeful a math geek will chime in.