It looks like it is time to send it back to Canon so they can have another go at it. I think only Canon can fix the IS issues introduced from the first attempt and I doubt there is any advice we can offer at this point to fix the focus roughness. For what it is worth, I do not have any roughness or sticking in my 10X42 L IS focus.
Sorry to be negative, but Canon does not have a good track record in repairing these units, at least from what I have gathered reading various posts on this forum. I am not sure if anyone has reported Canon getting it right the first time. I do recall at least one post where it was never repaired back to original condition. This is for both U.S. and non U.S. members. I suspect the repair people work on a variety of products and do not have the expertise of the people who do the assembly. The binocular is a very complex piece of equipment. I wonder if the world wide repair centers have the special tools and equipment that is most likely used to assemble these binoculars.
https://www.youtube.com/watch?v=T9zNtA4j3Eo
I believe it is still under warranty so give them another chance at a repair. Let them know if it is not right after the second attempt, you would like them to replace it with a new unit. That way they can send the original unit back to Japan and get it fixed for sale as a refurb. Good luck. Sorry you are having these problems as it is a great binocular when all is working properly.