I was trying to do the hard desert diary but one of them is to kill the Kalphite queen. I have perhaps killed the queen a half dozen times and always in groups. I was hoping that someone could assist me in killing the queen for the diary. Currently, I am killing kalphites in the slayer cave per slayer assignment. Could someone assist me in this diary.
Have you tried using Keris? (Weapon from Beneath cursed sands) even the normal version is good enough. If your range gear isn't great then use melee for both phases. Walk under when you need to eat so she doesn't attack you whilst eating.
Also, as you've said above having a slayer task will help with DPS!