What modem are you using that has the Lantiq VRX268 chipset?
Is that the Home Hub 5A with OpenWRT?
Also when I was with BT, when I was using the Hub 6 at the time I would always sync at 74Mb no matter if I rebooted or replugged. If I attempted to swap it out for anything else I would almost immediately drop to 70Mb, is this because of the chipset used in the hub or would it be because BT can "boost" the speed when using their equipment?
Reason I ask is i'm wondering if I can recreate that again and hit 74Mb again. Baring in mind that Hub 6 (smart hub) used a broadcom chipset I believe.