didn't melee have their ability to crit heals removed a few years back, specifically in response to items like perserverence still reaching ~15% pretty easily on a non-caster? i seem to remember thinking at the time that it seemed like an obscure thing to nerf. i may be wrong. the only other answer though is that it's a bard specific bug, or if solo's observation is true then i would suggest more went on behind the scenes (probably by accident) during the nerf i mentioned. personally, i never noticed anything, but i may be excluded from potential bug as a hardcoded healer class, or perhaps it's just hard to notice crit rate as a cleric since they already have the highest base rate by a dramatic margin