Setting the outfeed table on a jointer is simple if you just use a board. Lower the outfeed to where you know it is below the blades, Run a board on edge about 8-10" into it, stop the jointer, raise the outfeed to match the cut on the board and you are all set. Jointer snipe is nearly always caused by lower outfeed table or improper technique. Setting the outfeed table like this will ensure you have that part correct. If you do this and still have snipe then you are probably applying pressure incorrectly to the board as you feed it through.
Good Luck,
John