Is cm11 installed in a primary (stock) slot or secondary slot? There is a known issue with high battery consumption using secondary slots in Safestrap v4. Unlike Safestrap v3 hdx roms should always be installed in the primary slot under v4.
On my cm11/safestrap v4 build cpu-z reports variable frequencies (300-2150 MHz) utilizing 1-4 cores depending on workload. Exactly as expected. Battery life has been excellent.
If you need to switch slots be sure to backup the existing contents and leave the backup on device until the new install is confirmed. Do not attempt to reinstall a secondary slot backup to the primary slot as you will likely overwrite key Safestrap files and render your device unbootable.