What diameter or make of cable are you using, also?
I snare a lot of beaver in 3/32" and I run a lot of 3/32" slide cables, too. Sometimes there isn't deep enough water nearby and the slide is just to get them out to deeper water even if its not enough to drown them. But still, I don't ever recall a cable chewed through.
Just curious, that's all.
Only other question I could think of for you would be frequency that you run your traps, especially if you are not drowning them or using #330s for immediate kills?
Jim-NE