I am still also of the opinion that there is something different about North Sea operations compared to other areas.
As I recall, most of the S-92 MGB housing foot cracking (severing & radial) occurrences some six or seven years back, were happening in the North Sea sector and when the OEM dug a little deeper to understand why this was, it was noted that crews were routinely pulling more Tq than in the GoM or Far East.
If my memory serves me well, in addition to Phase II/III housing replacements, the OEM also sent out AS/Tq recommendations to the operators.
More Tq = more fatigue/stress.