I think the car is not that hard to set right...
Its almost like the BD5... Look at Lucas Urbains setup sheet on Petit RC thats what i was running with all kind of motors... I´ve tested Ronalds Setup in Modified and it works also great...
Maybe you guys need to put more attention on the build of your car... And every good shock needs to get done after a day or two of running...
And just put 2000K oil inside the gear diff and you´re will be fine... This car only needs attention on a good build and a little bit of love... ;-)