[buzzinhalfdozen]

Bobby, in my opinion the best place to create an ignition signal is at the crank. Using the dist. can induce a fluctuation in the signal due to many factors such as chain or belt whip, plus the gear interface of the cam and dist. gear, compounded if you're also driving the oil pump. looks like you could install a standard crank trigger set up and still use the cam sync input from the dist. for sequential. I wouldn't think the real issue is the actual RPM of the engine but more a result of all the potential lash in the system. Most dist. based cam syncs will vary a degree or two simply due to the lash in the system. Good luck Joe BTW this is all assuming that the dual sync is the actual problem.