The sad thing is that the RAF TriStars have less than half the hours and cycles you quoted.
Which begs the question, why were they prematurely retired by the original operator and why were there so many stored out in the desert?
I'm not belittling the RAF AT operation - I was part of it myself once. I'm questioning the choice of equipment provided for the task. Sideshow Bob has hinted that the Tristar can't operate to maximum load out of Kabul which may be a clue as to why the Tristars were prematurely retired from civilian service.