Possibly, your numbers look much better now.
I didn't reply to your question about the OVP, because it is like one of the ASE test questions: no one in their right mind would suggest that a fuse could be anything other than open or closed. But if your findings prove out, the OVP is actually looking like a resistor.
By having any current at the EHA the OVP "should" be considered working.
I have seen the oVP act as a resistor before but only in the control of the idle valve. The idle valve current flow is many orders of magnitude greater at 600-1000ma. But you may have had problems there and weren't noticing it as idle does pretty well "limping home".
Bosch Master, ASE Master, L1
33 years MB technician