Agreed. It was a simple question with a simple answer. if you dont like flutter, then f**k off and dont post. Noone cares what you have to say.
So anyway, back OT, im guessing there will be a little locking nut you need to undo, then wind the screw in a few turns, and re lock the nut.
Just try it on different settings untill you find a sound you like.
I have a Greddy Type RS and did the same. I didnt want flutter, but having it really loose sounded poop, so i tightened it up a touch. I get flutter at very low load/boost and light VAC, but once the boost is up a few psi it opens properly.
I dont see it causing any harm. Has been like it for a year or so now.