I can't see anything obvious from your graphs.
Your latest resync was in the early hours though, when SNR would be at its lowest.
Things may improve (speed-wise) if you forced a resync/reboot at say between noon & 14:00.
Unfortunately, unlike ECI DSLAMs, the Huawei DSLAMS don't appear to report graphable US SNR, QLN & Hlog data, so we are unable to see if there have been any negatively impacting US changes.
(Although pbParams suggests that not much has changed).
Your SNRM tailing off & staying low still seems very much akin to what I was seeing on my connection, right up until the SSFP was replaced & the connection between the underground feed cable & DP was repaired.