how to get assaults to stun

When I get to to about 7 levels above my survivors' levels I hope to get my assaults to stun since they only get body shots. Been changing traits and badges to help in this effort but still have a long ways to go to get everything I've seen recommended. I thought "okay, so you have to be charged to stun but if you can not kill opponents then you can not charge. Infrequently, I have seen my assaults stuns if against levels that are about 9 levels higher. But not sure since I rarely get there. Example: my Abe is now level 26, and I can not seem to damage a level 34. He has Iron skin, retaliate, dodge, and lucky which seems like a pretty good layout. I really need to improve badges as I only have 1 health, 2 DR, 2 low base damage, (do plan on going all defensive) I have decimeter, daryl assault (level 30) and now upgrading golden assault to 28. What am I doing wrong. Are assaults able to stun only when against levels 40s as shown in all the you tubes?
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Comments
Stun will only fail (on charge attack) if the event has stun resistance or immunity (such as a tank walker)
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