28.5 pounds seems like a lot for that bike and size. That is a quality steel tube frame and full carbon fork. The rims arent porky(I have them on my gravel bike too), and you are even running a Gatorskin rear tire so that maxes out at 32mm and isnt too heavy compared to gravel tires.
I bet even though the tubing is quality, they spec it beefy for liability and reliability. Even still, I would have guessed your bike weighs 24-25 pounds without bottles, bag, or wedge bag.
https://www.cxmagazine.com/bike-revi...cross-off-road
This model was 21.2 pounds as tested. Hydraulic instead of cable brakes.
https://www.theproscloset.com/produc...-frameset-2019
This weighs 3100g which isnt great but also not terrible. Figure 450g for the fork, 70g for the thru axles, 25g for the seatpost collar, 20g for bolts, and you end up with 2535g for the frame(assumes no bearings were in the frame when weighed). That is not light for a quality steel gravel frame, but you shouldnt expect it a mass manufactured steel gravel frame of that size to be more than 250g lighter, which is half a pound.
Do you have lead wedged up in your seatpost?