I had the same problem the first time I had my vx mapped there, two other rolling roads said 215bhp and 213bhp, NMS said 185bhp. I was gutted and was in denial for months :crazy:
But then I decided 'so what', if thats the true bhp 'so be it' and set about getting past 200bhp once again, this I achieved with the next engine phase - 218.8bhp at NMS. Then I wanted 250 bhp :silent:
I managed 240bhp and then one exhaust valve decided to snap, so phase 2 rebuild is ongoing and I'm still aiming for 250bhp 8)