You can try to "throw" yourself into it more. Swing your arms forward with your last step. Also, aim for the other end of the table, you are planting too early.
I also recommend trying 2-step take offs. For kongs that are long and low (like across a picnic table), it let's you keep more of the speed from your run-up.
Again, try Chris' thing where you just try to jump and plant without actually worrying about clearing the obstacle.