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I agree with Prodigy, you're going overboard with >20psi, especially with the .64 hot side - the .86 breathes a bit better on the top end. As far as your boost problem, it sounds like your wastegate should be tightened almost all the way (tight enough for your .8 low boost setting), but it's still going to have a hard time holding 20psi, not to mention 25.
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