Is Camille's Q Busted?

With 300 AD and Trinity force, your Q will do roughly 850-900 true damage. Without the Trinity force proc it only does 540~ from my experimentation. So why isn't it 540 true damage + The physical damage from trinity force? Why on earth would it convert the TF damage into true damage aswell? This is already a powerful Ability and interaction as proper timing(almost guaranteed by the ability mechanics mind you) already procs TF Twice. Why on earth is adding even more unblockable damage to boot in anyway acceptable. That's a whopping 255 + 300 (AD) + 120 (%AD damage) = 677 (before mitigation) physical damage on the initial hit, and 255 + 300(AD) + 240(%AD) = 795 True damage, Not including any other variables, (other on-hits, runes ect.) Meaning a total of roughly 1845 pre-resistances damage from her Q alone at level 18 with 300 AD. Which can be achieved similarly at level 16 and 315~ AD.