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Synapse says "A unit that is within synapes range is not subject to the Instinctive Behavior rule (see below) and gains fearless..."

First off it is fearless regardless of IB while in range as that is clearly separate from the IB bit. As for being effected by IB, Synapse rather specifically states they are not. For any IB rule to overrule Synapse an any way it would have to specifically state in some fashion that synapse cannot overrule or that it cannot be overruled. As it does not, there is zero reason for IB to effect a Nid while it is in Synapse range. You do however make the test if it did not start in range as per the rule because you are not at that time within Synapse range. If the model is within range by the time you get around to moving it, IB will not effect its move. Same for shooting, running, charging, etc but you must stay withing range or it's back to IB (if you failed the test).