I love this forum. I've been looking at posts for awhile now and there is so much info it's great!

I'm a total noob when it comes to setting up a car correctly. I usually build it according to the manual and I don't deviate from it much. I only bash, no racing at all.
So i have a few setup questions regarding my Kyosho RB5(not SP)...
1. When i take a turn the tire rubs the bottom of the wing so before i start tweaking the settings i wanted to know how i should approach this.
Do i need to look at my shocks? springs? shock oil?
2. my steering sucks! i've played with the steering trim on the radio but i'm just not getting the tight radius i really like. I probably could upgrade the servo but before i do that i wanted to know what settings i should check to improve the turning radius.
Any help is much appreciated!!