Problem plowing snow

[BigBill]

My int154 using my duo cross chains worked great in the past plowing heavy wet snow. The first snow we got i had problems. I noticed it wasn't the tractor, i realized the ground wasn't frozen solid yet. the chains were digging in. Now with the second snow with the ground finally froze she is plowing now.

[outdoors4evr]

Seems like chains digging into the ground would not really cause problems plowing snow, but would increase the traction.
Well, maybe the plow would also be picking up a little dirt/gravel as well as digging up the lawn.