I've had similar experiences as yours. I think Marquette will always feature prominently in our vineyard, as it grows abundantly and produces beautiful wine. Ours tends to be a little more exotic than others I've tried - I'm not sure if this is our "terroir" speaking or something we're doing in the winery, but I'm not complaining. It's spicy, but not in a peppery sort of way - more like exotic middle eastern spices or something along those lines. It truly is a unique and interesting grape, especially since it's so easy to grow. Our 2022 crop was excellent as well, despite it being an incredibly rainy summer.
Mind if I ask what type of tannin are you using at crush? FT Rouge? I think I've read the same articles you have about adding tannins to stabilize color, but thus far I've taken a light touch, only adding a little. This year I'm going to add French oak dust during primary instead of tannin complex.
I only have 2 issues with Marquette: First, we've never had our grapes reach target 23.5 brix in the field. We always end up chaptalizing a little bit. Not the end of the world, but I'd love to see them get there on their own for once. Second, Marquette seems to be more likely to experience H2S during MLF, especially in the first month or so. I don't know if others have experienced this with Marquette, but I've learned to check it almost daily for H2S smell and take evasive action if necessary.