After all upgrades currently my weakauras are using elvui CD numbers but they are too small. Do you know how can I crease the size or how can I fix it?

just wanted to say that i have the same issue

The Problem still persists with 4.14. I made a Screenshot where you can see the font has the same size for every weakaura which makes the cooldownfont to small for some WA's and to big for other ones. It was much better before when the size of the font scaled to the size of the weakaura.

Having the same issue.

You can try Omni for bigger CD numbers they seem to work fine for me

Looks like this got 'accidentally fixed' in the most recent Dev version.