The M05 is leaps ahead to an M03. Every single parte has much more thought behind it. The M03 was meant to be really cheap in production, hence the very few parts. M03, FF02, TL01 all shared the same parts. Sure there are more parts in a M05 resulting in more play but the steering geometry is so much better due to the proportional length of the steering links and the susp. arms. This is why you don't have the erratic bump steer like in the M03. Front shock angle is much better as it is more lay down wich you must have with that susp arm setup (shock mounting hole above the arm to clear the wheel) so the shoch moves in a linear stroke.
If you have torque steer in your M05 you'd have even more of that in your M03. There's (even with a mabushi) to much power for too much play in your diff (a M05 diff has less play as a M03 one) and too much weight overhang of your motor. Live with it, ride with it and get over it. These are no high quality race cars but fun bashers.