Centaurus
there will be probably no right answer for your question.
Personally I consider the company SOP and most of the time idle REV it is.
Only after having thought about and briefed the landing mass, any a/c unserviceabilities versus available landing distance and the prevailing weather conditions.
On a dry and even sometimes wet runway Idle REV usually is more than sufficient.
If the runway is wet&slippery or contaminated than that is a different story.
Even on a long dry runway with a too long flare I will insist on Full REV being used.
SOP's cannot cover all cases and I think experience and aerodrome familiarity come into play as well, even flight crew recency issues.
Anyhow I think you should think about, brief it and be ready to amend it when necessary, but I do not believe that an intermediate setting (35%) will be a very practical approach.