I am looking to improve my pally tanking rotation as well but i want it to work with my dk priority system spam, this is what i have so far:

button 1: avenger's shield
button 2: hammer of wrath
button 3: divine protection
button 4: /castsequence reset=5 Judgement,Hammer of the Righteous,Shield of the Righteous,Hammer of the Righteous,Crusader Strike