Be sure it's "roast" that you're tasting and not some other source of bitterness/astringency. Very dark beers mashed with the wrong pH and/or type of water can certainly exhibit this as well.
What was the recipe and water source?
Make a much less roasty beer and blend it.
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"Water?!? Are you trying to kill me? There's no ALCOHOL in that stuff!" -Leon
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