Do you think its always charged at 4kW?
In the Ohme app take a picture up of the advanced settings page, whils’t boiling the kettle!
If its always charged at 4kW, it could be a problem with the CT clamp causing load balancing, which will throttle the charge output. Most likely scenario, is the CT clamp has been put on the wrong way round.
@Jojoe did you get yours sorted?