Sasha in the video I linked , at some point he referenced something I believe you have also said. Basically in the case of boost creep it generally shows up when people use too light of a wastegate spring. A fluctuation in boost in my opinion is not a "spike". Using the graph feature on the Greddy Profec, if I have a boost setting of 12.5 and it bumps momentarily into 12.8-13psi I can live with. A spike is what happened when I went from 9psi to 23psi.With the graph feature it's more observable as literally a bump or a spike.
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