sidefx: I think you really want something with at least twisted pair though.
For the RFI slider - mine made a decent difference to errors one notch to the left, without much change in sync or throughput that I noticed. Most others who tried it didn't see any difference in errors I think, but with yours showing so much RFI I wonder if it might have more effect on the error rate...
Okay I will test it tonight and see how it goes.