Despite multiple router reboots, the IP profile remained at 66.22mbps while sync was 72.14 ~~~91.8%

Today I tried a resync. The sync went down to 71.21. I checked the IP profile again and it was now 65.38mbps. ~~~91.8%

According to kitz, a G.INP + Huawei enabled line should be roughly 96.8% just like your line is. I intially suspected a stuck BRAS profile but this seems to not be the case. There seems to be something else at play here.

See here, a NewtonStar was getting 91.9% on his line last year: http://forum.kitz.co.uk/index.php/topic,17336.75.html - I also note that you contributed to his thread. I seem to experiencing the same profile calculation being applied.