Why not just give bosses a leap of faith suppressing aura if you're so concerned about boss kiting? Or make them faster. Having a capped fvs, if I'm going to tank, I'm going to shieldblock so melees can contribute dps and I'll take much less damage than a traditional tank, thus requiring less healing resources from the party. This is a non-issue, Turbine. Being party healer is a thankless enough (and sometimes challenging depending on the party) job, please don't take away some of the few perks we get.