Retridins use a so called FCFS (First Come First Serve) rotation, your cooldowns are so, that you will never have the same abilities ready at the same moments.
You have to prioritise your dmg spells
the most used priority is: Judgement, Crusader Strike, Divine Storm, Consecration
As was said before just prioritse judgements and from 20% downwards priority is Judgement > HoW > *all other spells*
Also on trash try to prioritse divine storm and consecration more so then judgement or CS