Try to achieve a larger separation in space between ESC and Rx, and route the antenna in a different way. If nothing helps, try sending the Rx in for a check before buying another.
If the plane flies like you expect it to, there is no need to try different propellers. Of course it is good to try and get that last 0.01% in performance, so if you feel like it go ahead (and perhaps report about the improvements!) [8D]: the 8x3.8 or 8x4.3 APC or GWS slowfly props should be a little more efficient than the folding prop you currently use.

Regards,
-Fabrizio