@mthodmn101: You have a couple of choices:
* If you're running a FW version supported by
JBPatch, it has a patch to do just that (tweak the sizes of each step in the Aa menu).
* If you're not, or you just want to tweak a specific font, check the linkfonts/etc/conf.avail/99-tweaks.conf fontconfig shard, there's an example in here to do just that. [The 'live' config directory is actually linkfonts/etc/conf.d, so, move your final config shard there].
FWIW, on my PW, I'm scaling every CFF font by +12%.
Code:
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<!--
Misc tweaks :)
-->
<fontconfig>
<!-- Make Crimson 12% bigger -->
<match target="font">
<test name="family" compare="eq">
<string>Crimson</string>
</test>
<!-- So tweak the matrix instead... -->
<edit name="matrix" mode="assign">
<times>
<name>matrix</name>
<matrix>
<double>1.12</double>
<double>0.0</double>
<double>0.0</double>
<double>1.12</double>
</matrix>
</times>
</edit>
</match>
</fontconfig>