Hi John,
There are a few things you might consider. Keyword stuffing is relative to the total amount of words on the page, so unfortunately there is no way around it but to generate more quality and unique content that are ideally on the page. You could start with the most important pages to you and see if it helps. The easiest way to add more content to the page, without writing more content, is to set list view as your default. Quality and unique short descriptions would be read by search engines on the category page. You can also try and optimise CMS or blog page(s) for the keywords, but that would take putting in the time and resources to making it really unique and value added. Other ideas would be to put tabs for content on the category page.
So the short answer is yes, it is probably seen as keyword stuffing, relative to the amount of content on the page. I know it's not exactly what you wanted to hear, but I hope there are a few helpful ideas in there for you.