You have discovered how to set up your bike for a nice down hill landing (like the back side of a double or table top). There are times that you want the rear end to kick up so you don’t have to wrestle it down for a smooth landing.
Ocracing is right, if you want to keep the front end up then keep on the gas as the rear wheel leaves the takeoff ramp. 4-strokes are more prone to nose dive due to the engine braking, so you will need more gas to keep the front end up than with a 2-stroke.
You can also try hitting the jump where there isn’t as much of a lip so it doesn’t kick as bad.
Good luck