Grats on the plat first off. Long time Shaco enthusiast here...
I have a inner conflict on leveling up his ultimate at 11;
-It lowers the CD by 10 seconds. Not a huge deal to me. This basically says to me "If you aren't using your ultimate in the first 10 seconds it comes off cooldown, you're wasting it." It's not an ultimate you use every available moment - you use it in clutch situations to avoid skillshots and Reqiuems.
-It increases base damage by 150 which is a good amount. I find it unreliable to hit somebody with this clone's AoE since it is such a small range (250) which is only double the range of melee hits.
I like the idea of a harder hitting, lower mana costing Deceive mid game (when mid starts taking blue every time). Even leveling up Jitbs sounds better to me for dueling junglers 1v1 for a 185 base damage increase per level if every shot hits and a longer fear.
What are your thoughts on this?
Also, doran's blades?