What I would personally recommend is investing in Logos that buff your attack. You can hold in tank stance and possibly split your magicite 3/2 and the logos that would increase your attack would basically give you the same as darkside while in grit. Take off grit (if you can manage properly) and you're looking at your darkside buff plus the logos buff as well.

Honestly tanking in eureka as a whole is very painful. I normally swap between WAR and DRK and usually just stick as a WAR so I don't have to keep DA's my attacks. It hurts your fingers to no end especially when doing things like dragon farms in Pagos.