Yes. You might be able to squeeze a little more downstream speed out of the line if you force the SNR to 6. You should be able to do it as you have a Netgear router.
http://www.kitz.co.uk/routers/dg834GT_targetsnr.htm
The article refers to the DG83G but it might work with other models of Netgear routers.
I've tried this but my connection speed now lowers. Is that expected?