You didn't have microfilters for everything?
Must make sure that every device plugged into a phone socket (router, phones, Sky box, etc.) is plugged in via a microfilter.
Yep, your attenuation is nice & low. Low enough that you could
potentially get 16mbps (subject to noise margin etc.). However: Some people on Sky BB Max do find they get capped at 8mbps, usually 'cos of their line.
More here on attenuation, noise margin, etc. -
http://www.skyuser.co.uk/forum/route...explained.html
I'd recommend replacing the faceplate on your master socket with one of these:
http://www.adslnation.com/products/xte2005.php
Then either plug the router directly into the unfiltered ADSL socket on it, or run a dedicated unfiltered extension from it for the router.
You could then also run filtered extensions from the XTE-2005 to feed the phones, removing the need for separate dangly microfilters everywhere.
You're probably on Sky's G.DMT, rather than ADSL2+, & so on Interleave rather than Fast Path (can check this via the detailed stats mentioned in an earlier link I posted, so long as you have the original Netgear DG834GT Sky router & not the new model). This can increase your pings.
Some people find they can get Sky tech support (Tier 3) to switch them to ADSL2+ & Fast Path, but others have no luck with it.
An alternate is to ask for the interleaving max delays to be reduced. This can affect stability though.