Dave - my only experience pruning that way
has been with ramblers - my husband will often
take a gas powered hedge trimmer to a well
established growth of 4 Red Cascade.
However, I also have rabbits who have a
tendency to do straight cuts on some of my
roses. Most do just fine and grow back without
a problem.
Given your specific problem rose, what about
an experiment? Prune a cane or two with
the straight across method, at the same time
prune another cane or two using the traditional
method. Keep track of how they do.
Good luck!
Gail
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