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Slightly restricted wastegate opening

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I've made an downpipe adaptor plate which unfortunately interferes with the full travel of the wastegate arm. Have milled a clearance channel which improves the situation but the flapper can still only open 30 degrees. I've got a feeling that will be enough and probably doesn't open much more than that in normal use (and probably pretty close to max flow too). Anyone experienced similar and had favourable result or mega boost creep? And of course there are lots of other variables. I'll find out soon enough!

Unfortunately the only way to find out will be to run the engine and test the boost control. The amount of wastegate opening you'll need will depend on the whole turbo and engine setup as well as the size of the wastegate.