The big difference you are trying to upgrade to fibre not move from adslmax to adsl2
mods will help just a matter af waiting till mods get back to you
can you post the adsl stats from your router
it may have been same line but different exchange equipment as SKY have their own in the exchnage. still speeds should be similar
if you have the hh4 can you post stats from helpdesk please.
are you using the test socket with a new filter?
certainly looks like you have move to adsl2
as you can see you are on adsl2+ 992.5 so definately moved from adslmax with your attenuation of 64.5db that would give a connection speed of about 2mb ewhich is about the speed you have. you speed is actually above that shown for attainable probably due to noise margin at 4.8db
are you using test socket?
Sky just use there own equipment and provide an LLU service but normally you would expect adsl2 to give similar results. However with the current attenuation you are not going to get much if any faster - unless using the test socket helps