You might also maybe be using mods from other sources that have their own controls over these things and can in some cases conflict, such as CmarNYC's XCAS and AwesomeMod. Have these changed beyond the defaults? Also, we need to look at the Max Sliders setting, the default of 100 might be too low in your case now. Well, first of all MC does offer a couple of settings that alter Body Slider Offsets and Body Slider Multipliers.
