The 5.7 is more than enough. My 2012 X-30 is equipped with the 5.7 and it's run strong for almost 80hrs now.
To date, the most weight I've carried hovers around 3,100lbs = 1,700lbs (sacs) + 800lbs (factory ballast) + 600lbs (gear and people). With all of that in the boat it performed very well.
__________________
X-30
|