[Plugin: heiv gallery 3] Directory Photo Shortcode and thumbnails

I am attempting to use the shortcode [hgallery3 id=”10″ render=”dir”]
I need larger thumbnails, but find that anything that is larger than 220px are cut down and overlapping. I verified with Firebug that changing the height pixels below corrects the issue. I have attempted to change/upload various CSS files but doesn’t seem to what to “stick”. After each change the height parameter remains at 220px. Can anyone give me any advice on making this change. I am looking for a thumbnail size of 202w by 270h.

.hg3_s_dir_alb {
float: left;
margin: 3px;
text-align: center;
width: 220px;
height: 220px;
display: block;

https://www.ads-software.com/extend/plugins/heiv-gallery-3/