BFG:R As is.
I like the current BFG:R but I would add one word to it....
"Vessels with a Mark of Tzeentch may re-roll the result of any critical hits they either suffer, or they cause on another ship. This includes the
successful results of any Hit and Run attacks." This way, it doesn't increase their chances of hit and run successes (because they wouldn't re-roll 1s in this case), but it does allow them to re-roll a result they don't want.