Is the problem coming from the fact that you can’t facetank long enough for you to stack multiple RE under nems?
If RE is your main source of damage, try stacking RR on rings instead. DG sigil…do they help a lot?
Hmmm, I think so… Now I am not sure again, I kinda forgot. Last time I use this build is for completing SR Lv50 and it was so hard and get one shotted from multiple bosses I can’t remember.
Also, I havent try the Vitality RR rings. I like to have soul harvest and RF and Attack speed overcap like that, LOL. Though I agree that those rings are worth to try.
No point getting +points for RF if you can’t hit 24/16
Also, maybe dual pandemics for the flat damage might be better? Can you actually stay in one spot long enough to stack, 3 or 4 RE?
Good point on RF, I see that without it RF still has 8 charges.
And no, I have tried dual pandemics. It’s trash. Low %Vit damage, weird based acid damage, and really bad set of stats. In the end, bonespike flexibility and bonus duration still win.
I even try it with 25/16 GoE:
https://www.grimtools.com/calc/nZoqjD92
See if you can make it viable. 
the reason why guardians suck is because they do more acid damage than vit. it’s really silly.