Basically i think your boost is forcing the BoV open, not having enough pressure to keep it open.. And it's fluttering.
This happens because the turbo is still spinning and making pressure, but not enough for a clean release.
Kinda hard to explain.. But it just opens a little bit and shuts. Has to happen a few times because you keep getting pressure in there.
I don't think you can adjust the spring on most BoVs?
If you are dumping properly from 3psi onwards you must have a very weak spring.
Mine doesn't stop fluttering until 7psi roughly.
You could either get a bigger BoV so the flutter will be shorter and quieter.
Or just plumb it back into the intake.
And to answer your question about turbo health.
BoV Flutter has nothing to do with Compressor Surge.
Your Boost is getting out the correct way, and your Turbo is safe my friend!
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