We have a HOL-DEM 980-A and currently using approx 2 miles of wire, the cows do not push it but the calves seem to frequently go under and do not seem to be to jolted by the bite. It has been dry and we should soak our ground rod probably, but could we be over running our capabilities? Is this something you could juice up a little or should we just buy a newer stronger model? Thank you for any help with these issues. John