B&Ms, new and old, are in no way rough. The headbanging in corkscrews, zero g rolls, and quick transitions are completely unavoidable on an OTSR coaster with corkscrews regardless of who builds it.
Sounds like Coasterbill is just a soft person who can't handle a bit of the Arrow shakes. X2 was fantastic for me in the back row, and being slightly rough is unavoidable with such massive winged trains.. You want rough? American Eagle, blue side, back row; You'll be jackhammering side to side so much that Mean Streak was a massage chair in comparison.