M8 and VT dual hall effect distributor

Hi,
M8 ver 6.05f software REF/SYNC modes 1 to 4. F1 help says active SYNC edge should occur midway between active REF edges.
How critical is this?
On VT distributor SYNC rise is approximately coincident with REF fall which I suspect eliminates that mode as a possibility.
Remaining 3 SYNC/REF modes put chosen active SYNC edge at various positions between chosen active REF edges but not midway between.
Intend to use DUAL edge timing.
Is this acceptable?
M8 ver 6.05f software REF/SYNC modes 1 to 4. F1 help says active SYNC edge should occur midway between active REF edges.
How critical is this?
On VT distributor SYNC rise is approximately coincident with REF fall which I suspect eliminates that mode as a possibility.
Remaining 3 SYNC/REF modes put chosen active SYNC edge at various positions between chosen active REF edges but not midway between.
Intend to use DUAL edge timing.
Is this acceptable?