Why don't they just add a minion %maxhp cap on Shiv? Like "damage cannot exceed 95% of minion maximum health". Wouldn't this fix the issue without having to oddly balance it around champion level and minion dematerializer?
It's something I considered. I'd do something like "75% max hp with a cap of [slightly higher than currently]." Problem is we didn't have localization time for it when we came back from summer break. And at this point I'm pretty sure the item's PvE damage is tuned well enough to not need to do this any more.
But yeah, actually a good direction. Wish I had thought of it in dev.