I get the sense English isn't your primary language and I am having a hard time figuring out what your problem is. If you are taking heavy damage from KJ, he should be in melee so you can use SOTR. If you are still having issues, it's likely because something is going wrong. There should never be a situation where you take a felclaws without at least SOTR up. Keep in mind paladins are the weaker tanks for this fight. An equally geared DK, Bear, or Brew is going to be noticeably easier to heal.
As far as damage without the ability to use SOTR, that would only be the case if you are soaking armageddon in p2, at which point you can use AD, Kings, BOP, or an external. Though most raid comps will have enough immunes that tanks don't even need to soak armas.
Watch this video of a paladin POV:
https://www.youtube.com/watch?v=67GTVveSZTM
Some things to notice that he's doing:
1. Always has SOTR up for the entirety of Felclaws
2. After the second stack of claws he uses Eye of Tyr or AD to further reduce damage.
3. Frequently he will get barkskin or Hand of Sac as well.
4. He had some really lucky Heavy Hide procs right at the start of fel claws.