What bander are you using Jim. I have a calicrate, but generally use the "California" bander now. Cheaper faster and easier to use from the side. But its hard to keep good pressure if you are doing a lot of big calves whereas the callicrate is so easy a caveman could do it.
I tried to slit the bag last year as the vet recommended i start. I work alone so dont have anyone to tail them. Found out quick a calf can kick damn hard in about any direction. Screw it, the extra week to fall off dont hurt me none.
How old are the calves when you castrate?
Had not heard about slitting the bag.
