Just a couple of quick points.
With regards to matching the CPE to the FTTC DSLAM, our Bald_Eagle1 has quantitative data which shows that using a Huawei CPE with an ECI DSLAM is sub-optimal. So by inverting that scenario, I would be suspicious of using an ECI CPE with a Huawei DSLAM -- as you currently are so doing. As you are interested in your connection statistics, then it seem to be a logical choice to procure a HG612 modem and unlock it.
It is recommended that all Openreach provided active CPEs (be they Huawei or ECI) are mounted (or otherwise suspended) in a vertical plain, thus allow free exit of warm air at the top and entrance of cooler air at the bottom. Any method of supporting the device in a vertical plain, rather than lying horizontal, will undoubtedly be beneficial.