Harsh forks?

When were they last serviced?
That's always a good place to start with a poor performing fork.

Tell us what bike, model etc you're riding and we will be able to give you more advice

If the forks are feeling harsh when landing from a jump (you say you are landing short) and you have been riding a relatively mild track previously, you may have a whisker too much oil in the forks which stiffens them at the end of the stroke. If you want the forks to sort of feel softer and blow through the stroke a bit, try taking out 10-20cc of oil per leg and give it a go. This is only one solution to your problem. Try it and if it doesn't work, replace the oil and try all the other stuff.. Keep records of everything you do.
Good luck!!

If your springs are too soft for you, you will ride in the stiff part of the stroke. Same goes for bad oil.

How much do you weigh without gear on?

Might need to get springs for your weight depending on how much you weigh. Don't forget that having the shock set up too soft could cause the forks to feel harsh and stiff. We need more info about your weight to direct you in the right direction

Yea dude you need springs first and foremost. Im almost as heavy as you and my kx would sit in the hard part of the stroke. The stiffer springs will hold the bike up higher in the stroke of your forks and shock and utilize the low speed damping ultimately giving you a smoother ride. Racetech springs and shock are about $250 and every bit worth the money.

Proper springs will make a HUGE difference.

Springs and valving have to work in conjunction. Trying to compensate will make them harsh.

Try heavier springs and back out compression but go a little stiffer on rebound 4 or 5 clicks to slow down pogoing