There are a few tips to fix missing skill.
Playing with timescale ~0.7
Playing with strafebot with reduced performance. I guess lower com_maxfps and pressing jump by hand can do it.
There are still problems of finding route and knowing pro strafing techniques.
So, using pro testers can be a good solution.
As it was said before, biggest fun is not planned shortcuts.
Testing basically has to fix 'bad' elements, which limit and get you stuck.