PoE Synthesis - Bane + Soulrend Occultist vs Uber Elder

POB link with current items/gear: https://pastebin.com/aL8Rba3G Notes: Cast speed nodes are personal preference, I have plenty of ES/Damage so I took them just for added smoothness while mapping - a wand with good cast speed will do. When mapping I swap soulrend with controlled destruction, with contagion tied to both a manual cast and a CWDT. It feels a bit better to clear with blight + ED in that setup than it does Bane. For bosses take Soulrend. Once kitted with some actual ES gear (my shield, gloves, helm all give shit ES atm) you'd be looking at around 12-13k ES, I just haven't bothered upgrading yet. Opinion on the build: I enjoy it a lot. I like the idea of using multiple skills for DPS, all of which feeding into eachother - Vaal Blight for extra chaos damage, Blight for wither while applying soulrend+essence drain, and bane to put up despair. I don't think the build is OP at all, however, this video is proof that you can kill bosses (reasonably) quickly without being particularly outstanding for single target.