I've made my own B4.2 mid motor conversion and so I've had to get better at setups, as there are no setup sheets. I've used the camber link tuning ideas to great effect. I can't say enough good things about them!
I've always put off matching the springs with no oil because it would take a long time (an hour?). Racing ended a bit early today, so I matched them. I ended up softening the front by two increments (green to brown). I can't believe how much better it is! It didn't oversteer like I thought it would after softening up the front so much. I'm a believer!