Oh dear. You changed more than one thing at a time. That makes tuning suspensions infinitely more difficult, especially over the internet.
If you only have one adjuster on your beam, lowering ride will make it stiffer by changing the spring rate and preload. With two adjusters on the beam you should be OK with moderate changes in ride height (1-1.5inches). It shouldn't change the spring rate much.
1) First set your tire pressures correctly, no more than 24psi front, no lower than 18 if you have 65 series sidewalls. Most use 22 or there about.
2) Set your shocks. MAKE SURE YOU START WITH THE SAME NUMBER OF CLICKS ON EACH SIDE! Don't trust little numbers printed on the side or knob. Click all the way one way and then the other, Count the clicks. Then set the shocks in the middle of their range. All 4 of them. They work together, or not as is the case right now.
3) Test drive, and always use the same road at the same speed.
4) If the ride action is a wallow or a large amplitude motion like a ship at sea, try upping the damper settings (stiffer) until it gets better.
5) If the ride action is jumpy and jittery and harsh then try going lower (softer) on the damper settings until it gets better. If that doesn't fix it the problem it's probably spring rate or tire pressure to high or the shocks are too stiff (BTW, KYB gas shocks will be stiffer than the Koni)
And if all that doesn't work find a good shop to help you out. There may be an issue that we can't diagnose from afar, or a problem that's obvious when looking at it, that..well, we can't look at it from here. Example you lowered it 1 inch on one side and 1.5 on the other by mistake...or something.
Good luck, and report back.