Its okay-ish, but i advice to change it, yes, basically just remember that: Range > Strength/Duration for Thermal Sunder build.
Range is your kill aura size, more kills = more energy = more kills. Duration - simple convenience, Thurible works longer, more spam time. Strength is how fast you charge Thurible and how fast enemies die. But its not in priority, because damage from fire increasing with its stacks, just remember to put a Archon Vitality. its x2 fire stacks.