The grip tape found on a skateboard can actually be defined as the grainy sheet, which resembles sandpaper that also comes with a sticky underside. Such underside needs to adhere to the deck’s surfaces as a means of increasing traction or grip. No matter what skating style you use, the grip tape is extremely helpful in your attempt to stay on the board.
To get higher ollies, I would suggesting resting your back foot on the very end of the tail and the front foot in the middle of the deck to allow for more slide. Popping as hard as you can and catching your board in the groove of the nose with you ankle practically resting in the groove will level the board out in the air. after this initial movement slide you feet back to the bolts on the tail and nose to ensure a clean landing.