Although… better ears correct me, but I thought stainless, while brighter is a bit mid scooped. Perhaps a nickel plated steel?
usually when people mean 'grind' that means both some heft in low mids and aggressive crispy clanky heighs. stainless hex-core strings do have more of that baked in than nickel-plated, where the highs are subdued and they sound warmer and politer.