All the above!
If you have a 1/8 buggy suitable steering servo to hand then bung that in as the stock servo is a bit pathetic! Ensure that the steering horn is set 90 degrees to the steering
rod and re-centre the steering collects. (They should be measuring 17mm either side of the slider).
Go mad and spend £3:19 by searching this: 1 x 51" inches (1.3mtrs) Adhesive Lead Tape Golf. Free 1st class post (uk) NEW
Wrap it around the centre rib on both sides of the front wheel, then around the inner rim. As a combo they track along (with the gold damped forks and servo) far better, especially along the rough bits. Getting the very light front end to behave more confidentley needs weight and it is a better 'Damper'.
If you an find an Erevo shock with the blue coded spring then you can get a better rear end to match. Me and Whitham69 used 10w in the front and 45-80 ish in the back with the stock spring length.