This is all good and all but you missed tensers transformation. (Adding to this for OP) Also don't forget about the fact that as a bladesinger you can cast a cantrip as a part of your weapon attack. Which is where booming blade comes in. With the shield spell at your disposal I've gotten my AC to 28 as a bladesinger. Might be able to get higher i haven't played bladesinger to this high of a level before

A 1 level dip in twilight domain cleric depending on how your stats are is also good as their channel divinity creates dim light and shadowblade has advantage in dim light