If the shock is off an SB6C, you'd actually need more compression damping. From the leverage ratio curves I just found, the Wreckoning has a much higher leverage ratio than the SB6C in the first 50% of the travel. It's also higher throughout the second half of the travel, but not as drastic.
Since the wheel will now have more leverage over the shock, you'd need to firm up compression damping to not be blowing through the travel.
The opposite is true in rebound - Since the shock now has less leverage when pushing back against the wheel in rebound, you should theoretically need to open that up a bit.
Regardless, that shock should most likely have enough adjustment range to get you dialed without needing a revalve.