Just so people are aware, the DPS gap between WAR and GNB is anywhere between ~2-5% depends on whether you're looking at rDPS vs aDPS. There's also fight-by-fight variance to consider, as well as the percentile bracket, but they're not nearly as relevant as rDPS vs aDPS. It's all well and good to look at rDPS when you're doing comparisons within a job, for the most part, but it doesn't give you the full picture when comparing different jobs.

Also, regarding E4S and Holmgang, while it is good to use Holmgang on the first Monolith, it's generally a waste to use it on the second Megalith. Hardly anything is going on at that point of the fight, so you're better off lightly mitigating it and saving Holmgang for the final phase (I use it on Earthen Anguish and have the healers pretty much ignore me up to that point).