Since I am going to use CV (I think) this is now a potential issue. I will need to make sure that voltage imbalance on the op-amp input doesn't create a problem. Some series resistance is almost never a bad idea.Sense voltage won't differ from the Vctrl at all unless Vctrl is set to a value beyond what the power supply can deliver. That is the feedback loop of the opamp. The opamp is going to drive the fet to whatever resistance value is required to make those voltages equal. That is how the circuit regulates current to a constant value and that value is determined by Vctrl.
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