I am wearing a set of armor/ornaments, each unique without an iron banner armor piece under/over another. My crucible rank has increased faster then my iron banner one has at a 5 streak. (Currently fabled 1, while iron banner is Brave 3). With the boost at the current near of 2/5/1 for challenge/armor/emblem, I would think the rep gain would be more to the point Iron banner would reset before I reset the crucible ranks. Unless iron banner rep is earned at a lower rate then normal crucible which seems silly for something that comes 2 times a season
I've tried different combinations to the point of using no ornaments at all, and still the rep doesn't increase like the boost says it should
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Tl;dr bungie already knows and they told people not to equip ornaments, only use the armor and emblem, don't push the multiplier too high (max 8x otherwise stuff like last quest step or triumph won't register progress)