I tried the tip Farls showed on TWIM (arrow all the way up and left, directional line on the right side of the arrow 3/4 of the screen up), but found that it wasn't working for me... But then again, I wasn't using the Cowboys. Your kicker's attributes come into play, so the best squib kick is probably different for every kicker. Use your favorite team in practice mode and practice squib kicks until you find some combination of angle and power that consistently gets through.