You can define a different layout for /category/koitlin/
with a hack.
In your /_default/list.html
define your layout like so:
{{ if eq .URL "/category/koitlin/" }} .......Layout here...... {{ end }}
I have been berated for this hack in the past (see here) but this the only way that I have found to work in a use case like yours. And since this is for just one taxonomy term I can’t see harm in using it.