Hobbywing xtreme stock more problems?

[MrTross]

I'm running a gm 13.5t motor on my hobbywing xtreme stock esc and am haveing a few problems
Firstly which software version should I use?

Secondly wen iv changed my settings and use for first time the motor goes mad on boost for first 20 seconds or so then seems to run at half the speed after that? Is their an emergency cut of or have I set something wrong?

I'm very new to this so am very much in the dark so any advice would be great