What are the badgers after? The pigeons?
What are they digging up out in the corrals? Would it be easier to get rid of what they are chasing instead of trying to get rid of the badgers?
Sounds like you have pretty good success with your conibears.
It seems like a badger only digs one way.....at least all the badger I have watched dig down, find what they want and then back out or turn around.
A conibear staked at the entrance or a foothold buried in the den might be the best way.
