Yes it does have a sense wire, mines right at the battery essentially. The Crane ignition (analog, NASCAR version) I have with matching coil paperwork mentions that it will perform down below 8 volts,
They work but not optimally. From what I've read and understand from guys that have spent a lot of time tuning race engines different ignition types prefer different fueling ie richer vs leaner and when you improve the mixture quality. CDI being the better of the 2 when chasing power.