You should be getting about 16 Meg Sync. I don't bother checking IP Profile these days but on WBC it is generally 88.2% of Sync and changes on the fly; no more waiting for it to recover. You should see most of it as throughput.
Also on WBC, it will often settle on a 3dB NM on stable lines.
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 19 Meg WBC