Give Dorothea Coffee a call [1]. Selfishly, I'm be curious to see how their Kenyan stacks up against what you've had: I recently had a batch of their Kenya Nyeri that was excellent to my taste … but I don't drink Kenyan that often, so had little to compare it against.
I got this coffee in, and it's pretty "roasty" for sure - it is a lighter roast but has a ton of roast flavors in the coffee. It isn't bad but there are a lot of coffees you can buy that don't have those flavors: https://minmaxcoffee.com/roasted-coffee/
Color me surprised you actually tried it! Thank you for reporting back, and giving them a shot.
Sorry to hear it didn't work out. They do so well with Ethiopian, Colombian, Rwandan (which is where my palette is dialed—berry, tea, honey, citrus), I assumed their treatment of the Kenyan beans was representative.
Do you have a source of Kenyan beans that tells the story of what Kenyan is like at its best? I'd love to try!
[1] https://dorotheacoffee.com/products/kenya-ndaroini-aa