3905 Emaxx, with Neu setup bizarre reception problem

[jzemaxx]

Hey guys I'm running a new setup that arrived this week that I was testing tonight. I'm running a 3905 Emaxx with a Neu 1521 1.5D and HV110 on 10S. The truck has insane amounts of power, but horrible reception. Everything is still stock as far as radio and reciever is concerned, and I'm running the Castle BEC. Here is my big problem. When I got the truck together with 4S my reception was great, then I moved up to 6S and the reception got shorter, then I jumped up to 10S and the reception is maybe 40-50ft max. Why is the reception getting less as the voltage goes up. Does the Castle BEC suck, or do I need a new ESC?? I tried seperating all wires away from each other, but that still doesn't explain the fact as the voltage climbs the reception shrinks. Does the BEC voltage need to be boosted up to 9V instead of the default??