Aftershock needs a rework

I am kind of tired of playing vs aftershock lissandra and sylas, I think the rune having flat armour and mr wouldn't be so bad if it was just being played by tanks. However giving champions 70-120 additional armour and magic resist when they may have 30-60 just seems a little bit crazy. Now, I dislike tanks particularly playing against them because they tend to not be very interactive but I think making the rune % increase in armour and magic resist is a more balanced way of going about the rune and may be more beneficial to tanks. Even a combination of the 2 for tanks early game where they get a less amount flat + % resistances would be a better way of going about the rune and making it a bit less powerful on mages considering they get quite tanky regardless from all the Hp in relatively cheaper mage items. Just some thoughts from a shitty plat player lul.