Hope this helps, sometimes too much info is not good.
Your arrows appear to be fine here too...
I put the above info into SFA using a 2012 Z7 and set the draw weight to 68 lbs. and
the draw length to 28" with arrows cut to 28.5".
So guessing at the year and model of your Z7 my numbers could be off and the results
above may not be right but should be somewhat close.
Sometimes you get bullets paper tuning but still see bad flight and angled arrows in the
target proving so because of other things like shifting your achor point or twisting the
bow grip at the time of release or your centershot is just not quite right, fletching contact,
drop down timing not set right, nock point too high or low, string stretch after a while.
The list goes on.
Just try to concentrate on 1 thing at a time and focus on the process of elimination.
We are bowhunters we have no money but we are like doctors we have a lot of patients.
Many others have mentioned the spine is good so look to find other causes.
P.S.
Yup, I see your using a WB and not a drop down rest so that's one more off the list unless
you wore it out. If you did it's a good and cheep fix be happy.