As 11-4-3 Talon, I cannot deal enough damage to kill a 7-5-7 Tristana through Janna's shields

I have Ghostblade + Duskblade + Guardian Angel + Lord Dominik's Regards Tristana has no defensive items aside from Tabi. Perfect combo on Tristana (R + AA + Q + AA + W), no Buster Shot, no jump, and I just plain cannot do enough damage to kill her through Janna's shield + Locket. She just turrets me down after. This is pretty ridiculous
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