It seems to me like your Carmenère is a candidate for one of the “Wine Wizard’s” cheapest, easiest and most favorite ways to improve a tannic wine; egg white fining!
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Bracing Barrels & Coffee Wine
The level of caffeine, of course, will depend on how much coffee you used in the recipe — just as your average cup of joe will be stronger with the more ground coffee, so will your wine.
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The second and perhaps the most important reason is that if you’re doing your final rinsing with an acid blend that contains malic acid, you’re potentially releasing a food source for various bacteria into your equipment and into your cellar’s environment (like drains).