There's no way of "avoiding" being hassled, they all use the same computer system. Having been pulled into secondary inspection at some very rustic locations I can tell you by far the best strategy is to go to the POE which has the most CBP agents, because odds are at least one of them will know what they're doing plus their IT system is usually better.
NEXUS card might help at a major POE that has proper NEXUS machines, but there is still a CBP guy at a desk beyond the machines who can pull you in if he wants to. At the smaller POEs that are NEXUS approved though you have to go to secondary inspection in order to use your NEXUS card.
I'm not quite sure what amount of time you're comparing to, certainly things have gotten tougher since about 2003 for everyone and they're going to get tougher still.





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