This is indeed annoying. But you're only waiting for 2 weeksmany people (including me) are waiting since 8 months. I have deleted Crystal shard from all my damage bars. Because each instant cast will drastically decrease your DPS. It is better to simply use crushing shock+light attack, than waving in instant crystal shards.
Dear ZOS,i was waiting 2 weeks for your answer and didn't get anything.
So just put it here.Hope you will seehttp://www.youtube.com/watch?v=hIYnjQ_Z6r4
I'm not sure if I understand everything, but when I cast CF with all my Sorcs which have it on the bar, it's really instant, no delay (if it is instant, the chance is not very high). It sounds like it's a bug on your end then.