This is a really great question!
I agree with @Will Fraser on putting yourself in the appraiser's shoes. I actually start at 90 days and 0.1m miles strictly on bedroom count (i.e. 3) and property type (i.e. townhome), and then move the location out to 0.25m, and then 180 days if needed.
The #1 game changer to pulling good comps is looking at the map. Even if something is 0.1m away, it could be across the street in a separate development. Every time I look at the radius on the map, I question "which property would an appraiser most likely pick as a comparable?"
It works like magic and you will boost your confidence by asking that question.
I also remind myself that humans are innately biased towards how things appear. So if a potential comparable has the same street name as the subject property, there could definitely be some bias by the appraiser in selecting that house as a comp.
Unfortunately so many investors don't understand that at the end of the day, one appraiser will affect how "great" your deal is, especially with the BRRRR method.