IP Profile and target SNR

[#1]

Hi everyone,
I have now had my broadband running steady for a while. my downstream is happily sitting at around 14700 with a SNR of 5.5 how would I go about getting the target changed to 3 to see how this goes?
Also although my sync rate has been over 14000 for a few days now my IP profile is still a lot lower than this and I am only getting download speeds of around 11. Would there be any reason for this?
Thanks

[#2]

Your IP profile - from the BT Speedtest is 0.885 x sync speed so for 14700kbps sync your speed test result would normally be about 12,500kbps
What does the Plusnet profile give https://portal.plus.net/my.html?action=data_transfer_speed

[#3]

My plusnet profile is currently at 12.8 so that would be correct.
What should my download speed be in comparison to the IP profile? Higher or Lower?
Thanks

[#4]

lower

[#5]

That all seems about right then. Thanks.
With my SNR margin, should this decrease automatically if the line is stable enough for long enough?
Thanks

[#6]

in theory - yes

[#7]

OK great, thanks for answering my questions so quickly!