we need to number these requests

Deuxexmachina -

consider Divine Justice - lets you deal the same damage to your opponent as you take, pretty nice with Karmic Strike/Robilar's Gambit.

Though it may not be optimized, I might suggest one of those two feats, and work up the TWF tree to get Double Hit. So each time you are attacked, you strike back twice.

then again as the old saying goes, the best ability of the Paladin is "Should've taken Spirited Charge"

I might also recommend a level of Pious Templar for mettle.