I have been growing this rose for 8 years now. I'm surprised that it says here that Salet only has an "Occasional repeat later in the season". In my garden in Belgium, it flowers a minimum of three times (planted facing south). I've read other comments that say the same thing. Salet is a repeat rose, not an ocasional repeat rose. You should change that.
In my garden in Zone 7b, Salet has its main flush in May/June and occasional blooms in August resp. October. The photos posted on HMF show a similar bloom repeat.
I live in zone 6, ten miles north of Boston on the ocean (in a small city). I have grown Salet in a shaded area for four years now and have never seen any winter dieback - no damage to the canes at all, not even at the very tips. I strongly suspect this rose is hardy north of zone 6, probably by more than one zone.