It sounds like you was asking FDC's profile to go beyond it's boundaries...it reads the profile in FDC and then reads your aircraft.cfg and if the two don't match it will in turn let you know...
If you was "overweight" and I don't mean this personally, i'm surprised you managed to take-off...
I had a similar issue with a recent purchase of there 767...my aircraft was veering off course due to a setting in fsuipc, until I reset it to the default values and it corrected itself!