consider using an INA240 for the OCXO current sense
Compared to the LT1678, the purpose-built INA240 seems to offer better performance in input offset voltage, CMRR, and PSRR, requiring less (no) passives and being considerably cheaper. On the other hand, the opamp is also used in another part of the circuit. Should we consider changing it for INA240 or some similar offering?