So we try to balance all these. I will tell you from years of experience with the 912 that going from 5500 to 5200 WOT with the 912 will cost you on many fronts not to mention lugging your engine over its lifetime. This and a few other reasons is why FD got away from 5200 and went to 5500 rpm WOT eventually.
For me and I think for a large part of the 912 community 5500 WOT is a good setting for balance unless you need a little more flight characteristic one way or the other. The guys