adsl max upgrade

hi there im quite knowledgable when it comes to pc's as i am an it technician myself but my knowledge of adsl is a bit rough but i hope someone can help.
i have recently upgraded from 2mb to 8mb adsl with aol. the day after i ordered 8mb upgrade my router showed 8128kbps connection good i thought its done but as before i could still only download at 240KB/s which is 2mb.
during the 10 days (stabalisation period) i had seen no change in download speed at all only up speed went to 390kbps so i rang aol tech support they said may have prob on line so engineer was called out.
when he checked my line with his laptop and a trusty voyager modem it came back as connection of 7.1mb and 1db line loss (i am less than 300 meters from exchange).
but just before he arrived i noticed my speed increased to 4500kbps. still i am only recieving 4500kbps is this correct or is aol or bt still limiting my speed? also how come i have not seen any difference in speed during stabalisation?
any help please!!!!
malc.

A technical overview

http://www.dslzoneuk.net/adslmax_explained.php

Look at your modem stats

http://www.dslzoneuk.net/adsl_line_stats.php

and try to find your profile

http://www.speedtester.bt.com/

yes i did that speedtest from bt and it says my ipprofile is 4500k it was on 2000k yesterday it went to 4500k just before engineer turned up who said "you should get 7.1mb connection as your line quality is a1 and there is a 1db attenuation" he tested it infront of me on his laptop and showed me 7.1mb he even used my cables and filter. who changes the ip profile ?? is it bt or isp ? ,becuase that ip profile seems to me is what is limiting my download speed also stats from my netgear dg834g (firmware updated)

ADSL Link Downstream Upstream
Connection Speed 8128 kbps 448 kbps
Line Attenuation 5 db 1.5 db
Noise Margin 19 db 30 db

Edited by malcolmglyn80 (Wed 02-May-07 00:44:50)

The last part of the ADSL max explained link shows some rules for how your profile might change.