Issues with responsive setting

I like that this plugin comes with responsive design built-in, but at the moment it’s giving me a headache! For tablets, or any screen between 480px and 899px, my thumbnail images are stretched to 100% width and distorted something awful. After some inspection with Firebug, I can see where the code is being injected into the header, but I don’t know where the source is. I would like to edit this to avoid from having distorted images.

Secondly, I need the slider height to be dynamic, rather than fixed-width – the opposite of my issue with the images. Text is simply disappearing at the bottom of the slide, rather than it adjusting its height dynamically to fit the content. This is an important must-have as well. I hope somebody is reading these comments!

http://wordpress.org/plugins/smooth-slider/