Hi Steve
Kick-off returns have long been a source of frustration for many teams, while I can offer ideas on how to reduce the number of returns unfortunately I can't tell you the solution to eliminate them all together.
1 Have eleven dedicated special teams players, try having players maxed in blocking, tackling,speed & stamina.
2 Increase your rhythm settings until you find the right setting that reduces teams returns
Hope that helps.
Greybeard Griffins from #1