I second the above, if/when you can, assuming you haven't already, swap the radio out, I did straight away. I put in a Futaba 3PV courtesy of Guns but, I appreciate it's not a cheap radio to buy new and can't comment on cheaper options which are available. And I also removed the tower brace until I can get aluminium chassis braces, there was an interesting snippet about it in Aussie RC Playground's unboxing video. I'm impressed you went straight for 6S! It is a corker of a truck, I got the blue one.
Cheers,
Stu