You need to manually reset the dial-a-flap seletor to 15.
Yes.
Unless you are returning to the airport after takeoff, those speed bugs are just there to inform you of maximum airspeeds.
The trim settings in the FMS (barring incorrect numbers by you) are accurate. If you takeoff at low weights, the MD-11 is a very powerful machine and will require a high nose-up attitude to maintain airspeed.