Z1d 4GHz “sustained all core turbo” either a mistake or broken

I've been load testing z1d last couple days and cpu's are always set at the base 3.4GHz. Turbostat doesn't run (likely due to kvm hybrid on nitro). Tried changing the cstate to 1 but always showing 9. I can only see 1 core go up to ~4GHz and only for a fraction of a second and only a handful of times. All other times they stay at 3400GHz. I opened a case with aws ec2 support team who doesn't know what's going on. They said they are escalating to the development and hypervisor teams.

Has anyone else tested the z1d and been able to get "sustained all core turbo" of up to 4GHz?

sauces:

https://aws.amazon.com/about-aws/whats-new/2018/07/introducing-amazon-ec2-z1d-instances/

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/processor_state_control.html