Thanks for posting your stats (and for offering to take a photo of the PCB on the 2B).
There is a dearth of data for VDSL2 Profile 8c performance in the UK. Pretty impressive figures you're getting there.. I think yours are the best I've seen..
Any chance you would get a telnet shell on the Huawei and issue "xdslcmd info --pbParams" and "xdslcmd info --linediag", to get all the stats..
The output from the latter command runs to several thousand lines of data, so only good for copying to http://codepaste.net/