You can also give more leverage to the wastegate actuator, or put a prescribed-weight spring on the other side of the actuator that will net you whatever boost level you're happy with.
IOW - If you want 3 PSI max, and your wastegate won't open until like 10 PSI, get a 7lb spring and put it on the other side of the wastegate actuator arm. I don't actually think the math is quite that simple, but someone else suggested it, and I'm posting as a proxy.
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