Is there any difference you think between the 2020 and 2017 outback wheel well that would be of concern for me? It sounds like you have no rubbing or anything on yours so mine should be fine if they didnt change anything fitment wise in the wheel well.Great choice....exactly what I'm running on my 2020 Outback XT....I have just under 1000kms...with Zero issues! I've run them in everything a Canadian winter has thrown at us thus far and they have exceeded my expectations. A bonus is how quiet at highway speeds. I would comfortably say you can't even hear them.
Hope this helps.