Aha.. found the answer.
Was looking around for options and found it in the
wp-content\themes\hueman\js\jquery.flexslider.js file.
There are umpteen settings in it to tweak your slider behavior. I found mine under
FlexSlider: Default Settings > Carousel Options.
Added the following in featured.php under child theme and voila I got my carousel.
itemWidth: 320,
itemMargin: 5,
minItems: 3,
Of course, had to play around css to get right dimensions, margins, etc.