Herbie's mat with NAD 533

My NAD 533 with Goldring Elektra (with new Goldring stylus) is begging for a "tweak." Will the Herbie's "Way Excellent II" mat offer an improvement over the stock felt mat ? If so, what thickness for the Herbie's.....2 mm. or 3 mm. ? My stock felt mat is about 2.5 mm thick.