Need help with my new radio.

[JOHNNYMAXXIMA]

I just got my JR xs3 pro last week (thanks Mike). And I believe I have adjusted everything the way it should be adjusted. I read the instructions what seemed to be a million times. The problem I am having is I cant get it to go full throttle. When I squeeze the trigger all the way, it does not get to full speed, maybe only goes about 80%. So I plugged the stock radio back in for comparison purposes, and couldnt even give it full trigger in fear the tires were going to disintegrate (dual brushless has a tendancy to do that I guess).
Please help, I am anxious to do a top-speed run on this thing but dont want to do it on an AM radio.
Thanks.