If your chrome is a grey that usually means you burned it. It might buff out but if it doesn't strip the chrome off using 50/50 muratic/water, Activate the nickle in 10 to 20% sulfuric and chrome plate it again. Go over your surface area calcs and make sure they are right. If that is OK, then you may need to put robbers near the high current density areas (edges and high spots). One other thing, let the part sit dead (no current) in the chrome for a minute or two before applying power. Hope this helps.
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