Suspension again sorry

Well after lots of trial and error i have finally got the front end of my bike going where I want it to
The problem I now seem to have is my back end bucks a bit with the seat hiting me quite hard over fast bumps. Anyone got some suggestions. Sorry if this is basic stuff.
Thanks

Your rebound setting on the shock is too fast. Start by turning the rebound clicker on the bottom of the shock in ( clockwise) a couple clicks at a time until you get it where you like it.

start by suppying the model .

have you set your rear sag as yet , i have found that by backing off the rear preload it is much smoother , stops a lot of that kickback .

Thanks guys, the bike is a TE450 and the sag is correct, but may take a little more preload off though to see how it goes.

set the static sag at 40mm ..works to stop a similar problem on the 250