Experiences with bow centralisers on semi-flush Q-125 pipe

In context, the story goes like this. We are looking to use a standard GoM (sub-salt) well design around the world with a deepwater drillship. Rather than chop and change casing designs we see a merit in keeping casing sizes/grade/connection constant (even though all strings below 22in are either semi-flush or flush). An obvious downside is when a particular well design doesn't require all the casing strings and here, specifically, we have no need per se for centraliser subs and bows would do.

However, the 2 questions I have are:-
1. Have folk run bows on semi-flush/flush pipe and seen problems and, if so, what...i.e was the solution that subs had to be used or a change to the bow fastening ?

2. Conventionally 1 stop collar either is used. Given hard "Q" grade, is there any experience suggesting 2 stop collars might be advantageous i.e. double chance of stop screws 'biting/binding' the casing ?

Thanks
Mike
Hess, GoM

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