I also foot all mine.Most inserts have a lip slightly wider than the shaft so the footing usually butts behind that lip.I use the brass 100 gr inserts.I decided I didn't the way the insert lip was narrower than the outside of the footing and thought the leading edge of the footing might drag on tissue during penetration.
These days I chuck the brass insert in a drill press and turn down that lip to match my shaft diameter and the footing slides over it and so butts right up to the broadhead.The insert loses about 4-5 grs but it does make a nice,smooth transition.
As stated,occasionally heavy bone is hit but also there are misses and pass throughs where rocks etc can be hit.Beyond that,when I tune up a set of arrows,I want them all the same.The footed carbons have been the toughest arrows I've ever used though hickory may be right there with them.