There are 2 work arrounds for this matter.
You can get your front shock properly re-oiled and fix it a level up where you need that. Aparently, Khybers front shocks should be like, your car body almost 3 fingers up from your tyre's top.
Secondly, most importantly, get your rear shocks checked properly. Try to push your car down, that should come itself promptly against your force, this wud mean that your car shocks are good enough. For that, u need to change your springs only, not shocks. Install some springs of japnese car and DONT go for springs that are local made for lifting up CNG cars,,,,these wud harden your car suspension.
- Other work arround for front and back shocks could be of adding some PACKING matterial with the shocks. Don't go for packing of more than 1 to 1.5 inches. There are also different types of packing materials for cars. I think RUBBER packing is better than aluminium packing, that would be an add on for jumps.
After doing one of above 2 steps, CNG won't be a load on your car. But try to go for CNG first, so that later you may come to know how much you wanna lift your car up.