I picked up the same board cheap last year and had the exact opposite observation/question. I sent in pics to Burton and they said there is a variable amount of center rocker in the Sherlock (or flying V in general). Mine was super mellow; probably more like your CustomFV.
Obviously most of that will compress under weight when you stand on it and probably continue to mellow out as you break it in. I think Burton was doing there pre-flex break in process that year as well. Possibly some get more treatment than others.
Rad board on powder days.