Apologies if this question comes off as insulting, but just to confirm, if you're shooting manual, when you adjust the ISO to keep the exposure value the same right? The photo you've got there looks slightly underexposed to me
That being said, assuming you are keeping the exposure value equal, then conventional wisdom says that you get slightly less contrast (including colour contrast) with a wide open aperture. So if you set the ISO faster, and don't change your shutter speed, your aperture will be smaller, and you should be getting more colour contrast.
On top of that, each lens has its own "sweet spot" where it gives you the best image quality (sharpness, contrast, saturation etc) generally but not always somewhere around f/8.
So if you haven't already, true adjusting your ISO to 160, and getting your aperture as close to f/8 as you can, and adjust the shutter speed to achieve that.
What is going on with your moral compass that you believe that sometimes, funding bigots doesn't make you a shitty person, yet also lets you believe that disagreeing with you on that issue topic is enough to qualify someone as a shitty person?
If you can make an exception for people funding Rowling, you can make space for them disagreeing with you, without pretending that they're the problem