Throttle trigger soft spot?
 

Whats up all!!!
I have a DX3R Pro and want to know if any of you have had this experience. Let me provide my buggy's hardware and maybe you can help me.
DX3R Pro Radio
Spektrom SR3100 Receiver
Orion R10 Pro Esc
Orion 17.5 Vortex Pro Motor

My Problem.
I feel a huge soft spot at the bottom of the throttle, meaning i have to move throttle 1/4 inch before my wheels start moving.
Now, the things ive tried
1. Re-binded with all throttle settings neutraled (trim 0 and sub trim 0, travel set to 100)
2. Re-calibrated to the ESC several times with all throttle settings neutraled (trim and sub trim, travel set to 100)

Now what I've done to overcome this is advanced the sub trim to just where the wheels start to creep (+38) but I know thats a band-aid over an existing issue......or is it?
Any input you guys can provide is much appreciated!!
Kevin

Hope you find an answer, when I used the DX3R I could never feel the bottom end of the throttle, it was always way soft - then suddenly on. At the time I used 3 different speed control companies, thinking it was the speed control until I realized it was the radio - or the way the radio set up.