Thornmail rework idea

As we all know with the inclusion of items like thornmail and 1300 gold last whisper adcs can almost completely ignore thornmail completely and the damage return is almost useless as the damage generated is so high at full build mortal reminder can ignore up to about 50% of the targets armor with the inclusion of runes and masteries this is one item alone and not including items like black cleaver and maw which increases this even more building lifesteal on top of this further adds to the pain train and makes the damage return even less of a burden. The other issue is after the rework the damage the item returns punishes adcs for building armor pen and does nothing to those who build mixed damage. Sure the item alone is strong however it is only good on champs like galio, rammus,aric, shen, rammus or malphite it needs to be broadened to support more champions as well as not punish adcs for dealing lots of damage... to remedy this i propose the following rework....

build from + +1250gold the total cost would be 2500 gold and it would grant 80 armor and 30 magic resist. The new unique passive would read as follows. Passive: Unique: Thornmail reflects (10%)+(15%AR) physical damage taken and (10%)+(15%MR) magic damage from basic attacks or on hit effects back at its source (physical damage reflected as magic damage to the attacker and magic damage reflected as physical damage to the attacker). (Calculated before any resistances or reductions are taken into account) Additionally thornmail applies grevious wounds on proc for .5 seconds multiple procs renew the duration