I have had great luck with this in a sheltered corner. Most years there are some dead tips to remove and that is it. But THIS winter!
There are canes leafing out but also many dead to the ground
At least a quarter of them. And many are interior canes on a 6' plus shrub. If you know Darlow you know what a suicide mission it is to go inside.
SO I'm thinking of drastic action - reduce whole thing to under3' and then finish by removing dead stuff at base.