Hey Lee,
I'm looking forward to your work on the 502.
Throughout our local series I've been running both the 502 and 511 and while I love the acceleration and flight characteristics of the 502, it's very obvious driving it that it just doesn't steer round the corners like the 511 does - this despite the steering link mod (which did help).
Have you managed to get the 502 to handle the corners like the the 511?