All good, no big deal waiting.
Arcane Trickster! I was wondering why your spell DC was so low! That makes sense. I was basically built to avid failing a wis save. You know what they say, you fail a dex save and take damage, you fail a con save and you die, you fail a wis save and your friends die!
What source did you use, just the PHB? I don't remember if Arcane Trickster can use booming blade or not, but if so that would allow your extra mobility to kite around while I take damage. Really I think to be safe you'd need to get a DoT on me, and then stay more than 60 feet away so I couldn't catch you. Expeditious Retreat nearly worked, if I had been slowed that first round I would never be able to catch you.
But overall, you had a good build but a tough matchup vs my saves.