Hey @mleonard17 , the sensitivity is the yellow circle that appears when snapping, but I don’t know of any way to adjust it. You could double check that Snap To Self is turned on next to Closest, but beyond that I’m really not sure what could be going on.
Another way to straighten an edge (if you don’t want to eyeball it) is to scale to zero along whichever axis you want it to flatten against.
Hope that helps at least a little!
