I do have experience with Elemental Cadence since I was the guy who made Zantai’sMalakor’s Infusion Tactician back in AoM. Pretty sad spec nowadays. It even has aoe, lol. But it’s still super slow and unreliable.
About physical 2h Cadence - tested it before I switched to 2h BA and made my Big Bad Witchblade. Just no. Super bad and super inconsistent.
My suggestion is to add to some of the Cadence items/sets a mod that reduces a number of charges by 1 but also reduced a weapon damage by an approriate amount (like by 50-100%). It will add aoe (because more Cadence hits), will obviously add damage but most importantly will add consistency, since every second hit now can roll crit and high weapon damage value.