Dishsoap: Try a softer tire, Losi cars really seem to like softer compounds. I only run M2 or similar harder compounds on certain tracks. I ran M3 Bowties when I was down there or maybe even Red Eclipses if it's drier. Also you should try wider hexes in the rear LOSA3532. This will lock in the rear a little more and not allow it to swing around as easily.
http://losi.com/Products/Features.aspx?ProdId=LOSA3532
http://losi.com/Products/Features.aspx?ProdId=LOSA7769R
Talk to Chuck or Casey if you see them and they should be a little more help.