Problem with Fit Text

Hi! First of all, this module is amazing. It is really smooth and perfect for responsive sites. Congratulations and thanks.

However, I have a problem. I have a Flex slider view (page display) with some text. I would like to implement the Fit Text plugin (fittext.js) for responsive text, but it only works when I resize the window. And it's something with Flex Slider; other elements, outside the slider, works properly.

Any help would be appreciated.

Thanks!