Don't know if it would help but Tial springs fit into those wastegates.
You could take the waste gate's pressure line off and slowly take it up to 5000 rpms without boost and get on it gradually while watching the mechanical boost gauge to see if the boost goes as high as you want for a second or 2 as long as it doesn't approach going way too high if there is such a thing with the E85 gas and MS EFI you're using.
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