Try setting it to PPM. Has the PS713 got a separate FET Lead? If not try running a small capacitor in the receiver to balance the BEC power. You might also want to check if the FET choke is bust...
If not buy yourself a decent 9550, KO 2143, Sanwa ERG-VZ or even a Bluebird 6 or 8 series.
I've used the 9550, the ERG-VZ and a KO 2123 with Spektrum without trouble apart from having to use a capacitor in the receiver.
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