how to change face size

[tiktaaliki]

Love this package. Would like to be able to make the text size of the time blocks smaller. I can scale it to be smaller using ctrl + scrollwheel but then when I click on it, it reverts back to the larger default size. I changed all the face heights in the customize menu but it hasn't had any impact on the font size. Let me know if it's possible to change this. Thank you!