That looks a lot better

What problems are you having now? Your connection looks pretty good, it might be possible to squeeze a bit more out of it, but it would be at the cost of stability. You are showing some errors, not enough to matter, but increasing the speed would increase these and make your line unstable. I think Sky have done as much as they can for you, what speed are you getting now on Sky User - Broadband Speed Tester ?

The only way you may get any improvement now is to get Sky to move you back to G.DMT, it may run better on your line than ADSL2+. Mention it if you get through to CST.