Thanks for choosing Circle Flip, really glad you’re happy with it.
Setting your logo properly could be done from the theme options, if you could navigate to Appearance >> Theme Options >> Logo and Favicon you would find the logo builder, and under your logo wrapper you should find 4 text boxes, the first of those controls the width of you logo, and the second controls the height.
reference ( http://docs.creiden.com/circleflip/theme-options-2/general-settings/logo-and-favicon/ )
Hope this helped, please let us know if you need any assistance with that matter, or anything else.
Feel free to rate Circle Flip if you like it 🙂