lock vc_row height?

Using a template with a testimonial text slideshow which keeps changing height as it switches between text of different line length effecting all the text / content below even when it’s not on screen. Is it possible to lock the height of the row that contains the slideshow so that it doesn’t resize?

Here’s the shortcode being used:
[vc_row title_size="super" title_weight="hairline" title_align="center" title_underline="no-underline" swatch="swatch-black-white" top_decoration="none" bottom_decoration="none" height="tiny" width="padded" background_position_vertical="0" overlay_colour="#000000" overlay_opacity="0.3" overlay_grid="on" background_image_size="cover" background_image_repeat="no-repeat" background_image_attachment="fixed" id="testimonials" background_image="554"][vc_column width="1/1"][testimonials count="12" show_image="hide" slideshow="on" randomize="on"][/vc_column][/vc_row]

Any help would be greatly appreciated.