Hey there mate, good to see you racing the Genesis. Be sure to let everyone know how you get on.
As for the problems you are having, I think New Era Models did a pipe that would fit the .46. Might be worth a quick look around their site. The wheel adapters, as far as I am aware, have not been released yet. CENs' website has more info on them. http://www.cenracing.com/frame.html That should be a link to them, they are in the new products section.
Shock oil would kind of depend on the track you are racing on. If the ground is very bumpy and uneven, use a lighter weight oil to help the truck stay level over the ruts. If the ground is level, maybe a thicker oil would be best. If you e-mail Andrew Smolnik, he will tell you the set up he uses on his racing Genesis. Hope this helps.