I was looking at my owner's manual the other day (I have '93 KX250). I noticed in the section about suspension, it said if I lower the two nuts on the monoshock (or compress the monoshock), it'll make the suspension stronger.
Does that mean, when I hit a jump, there will be more of a kick by the rear suspension, or less of a kick. Stronger can mean two different things in this case.
Like Mr. Garrison says on South Park: "there are no stupid questions, only stupid people".
Just kiddin' with ya!
I assume what is meant by "lowering the nuts" they are referring to the pre-load rings on the shock spring. If so, then in this case by "lowering" (tightening) them, it adds more pre-load to the spring and therefore the spring will "feel" stiffer (stronger, harder, etc.).
Use the two nuts on the shock to set your sag. The basic rule is to put the bike on a stand, and measure straight up to the fender. Record that number. Sit on the bike and measure again. You want the rear to sag 3.75 - 4" or 95 - 100mm. Set this first and then see if you are getting your "kick" off jumps. (not exactly sure what you mean by that)
Be aware that when you increase spring preload the rear will rebound faster--which could get you in trouble, especially on a mis-timed landing. You may want to add one or two clicks of rebound.