It's an inherent design with the savage really, you can go all out for handling on a savage but you'll lose some of that wallowy character. Diff oil is a good start, thicken up the rear oil to make the rear wheels break traction easier, making it less likely to squat back and understeer and promote oversteer which you can control.
But this is all dependant on the surface you drive it on, loose surfaces will aid the low tech 4wd handling.