I'm recently more inclined to think it's possible that the actual spring rate is off than the design of the wastegates. But what it would take to prove that is several sets of Tial springs of the same rate. It may not be completely off but maybe small variances between batches. The 1.5 psi consistent differences I've seen aren't "spikes" at all but rather the guage reading consistently above the spring rate. The actual spikes I did have were directly caused by a hole in my passenger side vacuum line to the wastegate lower.
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