Thanks for the Reply, my lens is a CF so therefore is X-sync.
There is another thread also talking about the same topic I think but I'm still confused. I've made few tests today with the PC-Sync + Hotshoe now attached to the coldshoe on top of the PME90, then the remote Godox XProN, but I think I've not yet managed to understand how it works the whole set.
Thanks
JJ