My wife is plus sized, the only rides she hasnt been able to get between CP and KI is Millennium Force, which would also include TTD if it were ever open when were there. The seat belt is the issue there, not the lap bar. Which is annoying because she fits on Ride of Steel at SFDL with seatbelt to spare, which is an identical train. Not sure why MF & TTD belts are so short. She did get on MF 2 years ago, not sure if they made them even shorter.
Also, when we went to KI we didnt make it to Flight of Fear or Racer so not sure about those, and she didnt try Banshee because our kids were too short so I rode solo.
Edit: She couldnt do Raptor comfortably either. Narrow seats, wide hips.