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I had no issues (was way under the sound limit) last year with stock moto. Only difference to your set-up is that I used a 14″ silencer and the blue two hole freeline airbox.
1. Your silencer packing may be gone, try to repack the silencer. If that does not help try a 14″ silencer (maybe with downturn end pipe), RLV sells a special quiet silencer if I remember correctly
2. Try the freeline airbox. It should be better than the 4-hole RLV anyway (the freeline is the airbox of choice for stock moto).