Cold crashing and adding the dry hops when cold works fine. It avoids the possibility of hop creep, since the yeast are out of action. I don't think it affects extraction much, if at all.
Unless you bottle the beer and the beer gets warm.
In the first place, hop creep seldom happens in the homebrew world. I have yet to see a documented, proven case. Also, once you bottle the conditions that can cause hop creep have been removed. I wouldn't worry about it.
My experience as a judge indicates otherwise. We will have to agree to disagree.
I'd be interested to know how you know what you detected was due to hop creep. I have some judging experience,also.