The V130 had an alternative modem code for use with ECI VDSL cabinets - it shares the same version number but without the BT bit. It did add some extra performance to bring it close to parity with a Huawei cabinet but even running the other firmware it did not have the scale of issues shown above.
As I understood it, the Hardware Acceleration should make no difference when used in modem mode, especially with VDSL throughput, unless there is an odd parameter that looks for it.
Has anyone tried the revised UK-specific firmware on a G.fast line yet?