the database for btspeedtester is wholesale not BT Retail so from that I would expect it to be a central database
if your noise margin was reset to 6db that would increase your connection speed. as you have a stable 5 days conenction time we can see if mods will reset your noise margin back to 6db they will post a contact us link here
After completing the email NOT PM then you join a queue of other customers waiting for mod help. The mods will get back to you in about 5 working days either by phone or email
Thanks for posting. I can check if this is possible for you. Can you please drop me over an email with your details? You'll get the contact the moderators link in my profile.