Try to do a range check with the antenna out of the fuse and pulled up like a base loaded antenna to see if you get a better range check.

I run Futaba and I'm also not changing, I also like the JR servos, my radio is a 9C and have the same receiver. I haven't had that problem before, just yesterday I did a range check on my new Viperjet and end up with the turbine off, at 100 + paces ( I quit walking away ) with the the engine running, at 105 paces before the fail safe went on and stopped the engine, I'm running the base loaded antenna made by Dean's, this is the second time I get to use it on a jet with very good success and both install.

Here are some pic.