I thought that with a low signal current it was more a case of distinguishing signal from interferences rather than not being strong enough for the computer to pick up.
I believe there is better insulated cable out there than what wolf use, like coaxial computer cable or a good set of insulated speaker wires.
Simple solution for me is less gap = stronger signal and proportionally lower noise.
I didn't realize how bad the RB optical sensors were! I won't use one on my next project then.