For what it’s worth I would pass on the Kent 1.375 oz 1375fps loads. I have shot Heavy-Shot Classic Doubles 2-3/4” 1-1/8 oz. #4 1150 fps in a 12 ga. Specialty Grade Double Trap full & fuller without any problems so far. I plan on using them in Arkansas for decoying Specks week after next.
They also have Heavy-Shot Duck 2-3/4” 1-1/4oz #2 1300fps.
https://www.hevishot.com/catalog/hevi-shot-duck/. that is about as hot as I would go in any Classic Double.