They told me they did.
I will live through the season with a cunningham. They were responsive and open and told me an easy fix if it needs.
I will top my halyard this week-end and measure everything precisely.
Will also try to reduce as much I can on the top by not attaching directly the halyard but through a loop.

I guess my real question was: do you need to do any halyard trick - like not using a shackle - or less than 5/16 spliced halyard to max you OD main luff?
Cheers,