I was at the same race as Integra this past weekend and broke 5 steering bell cranks (tops and bottoms) all on the buggy but broke none the truck (I know of at least 8 others with the same issue at this race). I had done all the things noted here and on other forums - even put in gen. 1 spring which helped but still ended up breakin.
The spring is definately an issue but I think the plastic is also suspect. Never broke any part on the gen 1 stuff in a year and a half of racin.