Congratulations on your CA, you have decided for a great package! The included ytb springs should be a good starting point. On astro, you should be OK with greens in the rear and oranges or reds in the front most of the time. Maybe someone can comment on the new racing performer springs, I have yet to give them a try.
As for arms, the kit rears should be good as long as there is enough traction. Go for shorter arms in slippery conditions, combined with a ball diff. Front gull wing arms are good for on-power steering, and I found the car to be more forgiving when I failed to land with both front wheels at the same time. I never tried saddle packs, but with a modified motor the car likes some extra weight. Marc Rheinard tends to run more than 100 g below the shorty pack , i. e. as low as possible.
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