To reduce steering friction from the tires, you could simply increase the tire pressures up front... say... to about 36 psi... and see the difference.

A 70-series tire would be relatively narrow ... also reducing friction and keeping the path forward (vs. 60, 50, 40, 35, 30 series tires that favor cornering).

Furthermore, check your alignment. The more positive CASTER you have, the increased effort in steering response. A factory setting for your car is probably around +2 degrees (which is very little to begin with and not very desirable for handling, but better than any negative caster).