I don't know if this is a right place to ask, but...
What's the point in having the slow and execute on the same ability.
If you use it to slow the champion down, you just wasted your Execute since you used it on a full hp Champion.
If you don't use it at all you might not be able to make a good gank, since your CC didn't go off.
And by the time it reaches the limit to be an execute you could just finish the champion off in 1 or 2 AAs.
Maybe move the slow to Q so you can time your E better.
Thanks for reading, I hope I was able to deliver what I want :D even if no one cares :C because I know no one will care :C