I'd prefer a "DPS or tanking" choice, like a 2h knight only serie of augs that add a DD proc OR a shield only serie of augs that add damage mitigation and a 1h knight only serie of augs that add AE taunt with a smaller DD. The important point is that those augs should start dropping before T3/T4 since atm i don't see the point of a pally/SK in T3, plain and simple. Outside of the War/Clr/Rng golden trio... there's pretty much no hope except for utility/buff classes.
Here's a rough sketch :
SK/Pally 2h only augs (Slot 4&8 )
Slap of the Knight I -> 1000 DD proc, drops in LDON 6
Slap of the Knight II -> 2000 DD proc, drops in Qvic
Slap of the Knight III -> 3000 DD proc, drops in T1
Slap of the Knight IV -> 4000 DD proc, drops in T2
Slap of the Knight V -> 5000 DD proc, drops in T3
SK/Pally shield only aug (Slot 8 )
Slap Resilience I -> 5% dmg mitigation, drops in LDON 6
Slap Resilience II -> 10% dmg mitigation, drops in Qvic
Slap Resilience III -> 15% dmg mitigation, drops in T1
Slap Resilience IV -> 20% dmg mitigation, drops in T2
Slap Resilience V -> 25% dmg mitigation, drops in T3
SK/Pally 1h only augs (Slot 4&8 )
Call for Slaps I -> 200 AE DD + 50k AE taunt, drops in LDON6
Call for Slaps II -> 400 AE DD + 75k AE taunt, drops in Qvic
Call for Slaps III -> 600 AE DD + 100k AE taunt, drops in T1
Call for Slaps IV -> 800 AE DD + 150k AE taunt, drops in T2
Call for Slaps V -> 1000 AE DD + 200k AE taunt, drops in T3
Up to 25% dmg mitigation on a shield would make shields really worthwhile for tanking, and knights would be able to tank more high end content without sending the stonewall rotation into uselessness.
Just my 2 coppers.