Esplin2966, the solution is the LiHeat. Go with it.
BUT! In the sake of science, and if you have the time... I would love to see SaperPLs theory tested. I am curious to see if an EMI shielded POWERED riser would net better results than your current unpowered riser. The thought being that if it makes a difference, then we could probably convince LiHeat to release a powered version of their product?
Yeah, I think LiHeat is the solution as well. However, a powered 300mm riser cable is like $12, so I'm just gonna order one and test it FOR SCIENCE.