Hope this helps: Kindred's passive deals 1.25% of your current health as bonus on-hit physical damage per stack gained. So at say 14 stacks Kindred is dealing 17.5% of your current health as bonus on-hit physical damage per auto attack. If your stacking health it WILL hurt. Armor on the other hand can make your match SO much easier since Kindred only deals physical damage without Sated or Wit's End.
Try to hunt down the jungle camps that have Kindred's Passive Swirl over it so they can't get another stack to boost their damage to fast.
Good luck! [slayer-pantheon-thumbs]