I use Simplify 3D for my slicer. It is very good at building support on its own and it also allows the user to add or subtract from the automatically generated support. I don't use rafts for this part. There is enough material in contact with the build plate that a raft should not be required. For supports I use 1 dense bottom layer and 2 dense top layers. In between I use 15% fill. This yields a good finished part and easy support removal.