Jimi,
Supposedly center shot has been fixed. Unfortunately, only those who have shot the bow or set one up will be able to determine if center shot issues have been fixed with the Vectrix.
I know with the Trykon, in the 2006 Hoyt Owner's Manual, it says proper center shot should be set just left of the strings powerpath. So in all reality, here is where much of the controversy over center shot arises.
Many guys were seeing outrageous measurements when trying to get the bow into tune.The rest would have to be set way beyond thecenter or left edge of the strings powerpath. Therefore, making tuning even more difficult.
When I set up my Rip Cord rest, I am a bit outside (left of)the stringsand have seen pretty good paper tune results and broadhead flight.
Hopefully we will see some improvements in center shot with the Vectrix lineup.
Sorry this didn't get answered earlier.