Some questions/ideas:
Are you using Reflection Captures in your level? Metal will look dark and poor if you do not.
One technique for blurring could be to pass a noisy normal map into the UVs of the Render Texture. Would be distortion instead of true blurring but could get some effect like granulated glass…
Typically in PBR having a detail noisy normal map and a similar roughness adds blurriness to metal (by distorting the normal the reflection samples from). True chrome will not have a blurry reflection in real life, you have to finely scratch it to make it blurry. Maybe seeing your material could open more suggestions.