It seems to be blocking far more than just regular spam, but also typical "carry" groups (your key, our carry).

Is it possible to finetune this? Right now I have to disable the addon to find these groups.

You do not get the same groups every time unless there is a lack of groups.

I verify this daily, and there are no problems.

I'm aware of not getting the same groups. I refreshed it about 3 dozen times and never saw a single carry group. I disabled your addon and saw one immediately. I've done this on 3 separate occasions now on different characters.

Show me a screenshot of you mousing over said group please.

Can you not reproduce the problem?

Not consistently. Maybe its just confirmation bias, still "seem" to see more when disabled, but am able to see some while enabled. Thanks for reviewing.