RS Gordini - Exhaust too boomy

Morning Gents,

I am having endless issues with my RS and the exhaust drone. I have changed the set up twice now and still not winning. Currently have 3 straight through oval freeflow boxes and still find it boomy between 1-3k. I had 4 round freeflow boxes prior to this and it was louder than my current set up. The current set up has been on for a day or so, will this settle over time or get worse? Problem is i bought it with an aftermarket exhaust so there is no way for me to return to the stock set up.

Any suggestions?
 

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