My plan does have RCR on shoulders and shield. So before I blow you up, lemme revisit your plan. Found your plan in the TL;DR at the bottom of your post. TL;DRs go at the top. That’s the whole point of it. So you don’t need to read the post.
But both of our builds have SA costing 7.62 wrath. Flense restores 6 wrath per hit when fighting the RG. That means every time you attack (which is 5 times per second), you’re spending 1.62 wrath (or 8.1 per second). This means after 1 second, Aquila Cuirass is no longer active and you lose 50% DR.
I also see you using the Templar. I’m sure 3% dmg from Scoundrel is way better than gaining 1.1 wrath per second (still spending 7 over 5 attacks, that’s 35 in 5 seconds). You’re also using trapped and strong arms which is good for trash, but does nothing to the RG.