This. Also, most beginning jump builders make the lips too severe. One way that shapers determine if a jump is too lippy is to use a bamboo pole. You lay it with one end a the top of the lip and the other end going back to the transition. If you can slide your fist between the pole and the snow it is too lippy to be a park jump. You can use an eight foot 2 x 4 if you can't find a bamboo pole.
An urban jump can have more lip than a park jump, but really not that much more. If your lip is too severe, it is the same as having a transition that is too steep. You will scrub a bunch of speed, and it will be tougher to get a smooth balanced pop.
The other thing I would add is to make the pile for your jump, then boot stomp the crap out of it while adding salt, then carve your lip out. When you try to pack a jump out using the back of the shovel, you will never be able to get it solid enough.
Huck off and fly!!!
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