Take the following as "in general" as I am running exotek and schelle (graphite) chassis between 2 different vehicles but it works well on both:
I ran the 3 x 1.3 hole pistons all around myself, the VRP ones. I liked the pack they gave off of jumps but for our conditions it was too rough and loose at points for it. I ended up going to what my daughter was using, 2 x 1.6 and 2 x 1.7 front to rear and and it calmed the vehicle down and gave it more grip. from what i recall I am running 450cst up front and 350cst rear. That or 50cst down. Its PT racing oils so there are some conversion charts out there too.
I also run gold spring up front and the blue rear spring. Yellow up front gave it a bit too much aggressive feel. going to blue instead of what I think was yellow help give the vehicle a bit better planted feel too.
I also have the shocks leaned over on the rear tower a lot for our conditions, helps a lot.
How do you like the AKA impact tires?