Yeah, both Bambu Matte and Bambu Silk are in my view, horrible filaments. I keep the rolls around for experimentation purposes but they are awful under any comparison.
Here is what I used that is head and shoulders above bambu at a fraction of the price. Unless you need their magical spools, I’d consider this as a much better solution.
Now if you’re really stuck for a solution. You can place a layer of Polymide(AKA Kapton) film over the build plate that may help. I used this stuff.
