That's good Paul, it's a margin above where mine started too.
Are you getting any tones in the upper reaches this time (above 8.5MHz)? However I found that my line didn't gain interleaving until about a fortnight after installation when the latency jumped overnight from about 8-14 and has stayed consistent at 14-15 ever since. A pity that without the fixed IP address you can't use the TBBQM which is invaluable: mine is here and has been consisent for ages:
My Broadband Ping: the old Fritz! does something odd hourly though, and the peak is the daily download.
The good news is that I now seem to have stablised, according to the BT Speedtester with a download of 38/38.71 IP profile, also consistent with speedtest.net. Upload at 6.6/10 profile.
I'm also consistent with the SIN at max/min of 40/20 download and 7.2/3.6 upload.