how to tune your shocks

[t-maxxracer32]

hey guys my xt8 shocks feel petty weak and I think they are set up wrong
the shocks sit very low as if there is either too low wt of oil or too much wt of oil
I think they are set very heavy right now so is that why they don't rebound?
I have 2 of those big clips on each shock and I remember when I first got the shocks they seemed real nice
once I changed the oil and put all the electronics it sorta lost its nice rebound or w/e its called
what can I do to get the truck to have a nice shock setup?
thanks!