Don't remember if you saw this link or not but if your track has Losi or HB buggy parts they both have springs that are close to the green. HB grey & Losi red.
http://www.rctech.net/forum/members/...ring-chart.jpg

Edit, I see what your saying about the control arm wear. Many changes can be made with those like limiting how much the front nose dives under braking, how far your front end will allow itself to lift keeping more weight on the tires to get power to the ground while exiting a turn. Left/right roll... a good tool to use.
But for now keep it simple and one thing at a time to improve your tune