Hi Steve,
I to am researching the Schulze family tree and I havent been able to prove it yet but there is apparently a Valentin in my family tree. If correct Valentin (1661) was 1 of 5 children of Heinrich (1623) Schulze. Valentin had 4x children Heinrich & 3x Johann's S, J & N. Johann S ha6 7x children.
If you check this i would be interested if any of this matches.
my side of the family emigrated from Germany ~1900 to South Australia