Have you ever heard any other 3D printer pushing 300mm/s at 10K acc? you might be surprised, it won’t be any different, it’s physics, you are trying start and stop pretty decent mass of metal and plastic in microseconds at such speed so no wonder it rattles, I’m pretty sure if you slow it down to ~100mm/s with i.e. 2.5K acc and turn off the side panel part cooling fan the noise level would go down significantly, the question then would be why buying high speed 3D printer if you plan to run it slow