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I've been using Megawatt PSUs for some time. I parallel two 50A to run my DX-500 and I use #6 cable to tie them and [power a hub that connects my Amp to the power. My idle voltage is 14.2V and during full output I drop to 13.9v. Never lower. These readings are taken at the hub where the amp is connected. I also use an independent 50A Megawatt to run my SR-955. It idles at 14.6 and drops to 14.5v when TXing. I know you'd like the answer as to why you have this issue, but if you decide to change PSU I would just recommend Megawatt.