Wheel play, replace axel carriers ?

would going to an aluminum axle carrier help, I have the same issue with a used roller I am building on, I have some washers ordered to shim between the wheel and wheel nut, so I will see what I need, I remember Brian had written in a recent post about running a Revo with aluminum carriersand he uses those because he had gotten a good deal on them, I have thought of upgrading to the RPM carriers