No dyno is ever going to be truly accurate as humidity and temperature change. Same with weight and other conditions. Most people won't notice subtle differences in HP (myself included). It might matter for racing or on the drag strip.
This kit does bring the bike alive, but I don't think everyone will hit 50hp straight out of the box. I am happy with the power though, and having bigger numbers is just an ego boost for me and most.
Variance between the 2 units and the operator. Not to mention air quality and temps.
Did your tuner jet the bike once it broke in, in between Dyno runs?