For the rear. I would first check to see how full your preload adjuster is. Back the knob all the way out, counterclockwise, keeping track of the number of clicks (half-turns). Now start to dial it in, clockwise until you get resistance, keeping track of clicks (half-turns). How far did you turn it in before you felt resistance? How does that compare to the initial setting? If the number of clicks it took to encounter resistance is equal to or greater than the number of clicks you had to back it out, then you had NO preload dialed in to begin with and that may be the problem. On stock brand new bikes, I'm told you'll feel resistance at about 4 to 7 clicks. On a preload adjuster that has been refilled, it should probably only take one to two clicks to feel resistance. With no preload dialed in, you may be bottoming out. There is a great article on this forum on how to refill the oil in the preload adjuster. I did it a few nights ago and it has made a world of difference in the feel and grip of the rear end. There is also a dampening screw you can play with.
Igofar has spent a lot of time dialing in his setup and I think he is closer to your weight than mine. He suggests turning the preload adjuster to four clicks in from feeling resistance (after you have refilled it) and two full turns on the dampening screw (stock setting is one turn). That's probably a good place to start and may even work for you.