When I tried the l setting it stretched out the avatars to 122px. I was just looking to get it back to the default 96px.

This in extra.css did the trick:
.XenBase .messageUserBlock img {
  box-sizing: content-box;
Upload the new /xenbase/ folder inside the included /styles/ folder, we'll inform you if you need to upload the purchased style folder(usually changes aren't done to that one at all)
I am using Zipped Dark. Do I need to upload and overwrite only Xenbase or also Zipped folder?

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