Warlord Bloodlust needs better balance

Currently every 7 autos (or while you are moving) you got 1% - 50% lifesteal on next basic attack

So at level 1 you get absolutely nothing while at level 18 you 50% lifesteal? Early game i am without any keystone at all while lategame i got massive healing? How is that balanced?

So I am suggesting that you get 10% to 30% lifesteal based on champion level so we feel we get something early game while its not that overpowered lategame

If you get BT that has 20% with 30% lifesteal at level 18 = 50% lifesteal Ain't the same shit on what we actually wanted to achieve?