Hey,
in my observation, r/k is really bad dps in this moment and he is crap tank.
About dps i will be silent because r/k should be tank in my opinion. I have ultimate t13 gear (4-2 dex-str), i cant tank rofl and inferno. I have jewellery set, raksha dagger and wings with stats:
Sta/sta rofl, gorge, inferno and Sta/dex rofl, gorge, inferno.
With this and with reduction from p/d i can tank inferno. Rofl with sigils is impossible, maybe if i will have full dex/dex gear or sta/sta + sta/dex i will can this but that will be crap gear only for r/k. For example champion can tank in full dps gear. Rogue dps gear is 4-2 or 3-3. R/k have small amount of deff, zero dodge, zero evaporation, have only one reduction (35% duration: 10 sec cd: 2 min). Additionally he is only combination with knight which cant use shield of discipline (s/k cant use too).
My propositions about r/k:
1) let him do dmg without tank trasformation
2) let him use weaker form shields of discipline without shield or let him use shield 
3) increase duration of Holy Light Protection or reduce CD
4) maybe sth like on k/r - healing from dodges (but he dont have dodges
)
5) Permanent reduction dmg - 20%
I dont need all changes, that are only my propositions about what we can do to upgrade r/k gameplay and utility. That is only my experience.
Best regards and invite to the discussion 