Sylvain,
Sometimes, when stems are not round, it is difficult to determine correctly a sense of growth.
I looked today at last year 5* seedlings that were left after I separated really hybrid ones.
Majority are counterclockwise like 5*, but I found several seedlings that are clockwise. Can not can be 100% sure that are all nucellar.
Interestingly, I have a variant, clockwise 5* seedling from 2011, that has had an amazingly rapid growth.
It is now approximately 4 tall, flowered last year and it seems its fruits are less acid than that of original 5*.