If you get stabbed a lot, try aiming for the highest angle with maximum firing momentum. This can help you gain the advantage of hitting a lot of flying TNT, BomBalloons and Rockets, which hurdle you further for distance maximizing!
I had the opposite problem. I never got stabbed. I had to launch over 50 times to get stabbed 20 times, and the last 40 launches I was trying to get stabbed.
I would think that if you want to get the implaled quest as soon as possible, don't upgrade anything at all and that way you wont keep on going and going and going once everything is maxed.
Just launch max power and angle as low as possible. Wait till you destroy or get empaled. And if you're almost at the ground just use a bomb. Got 3 empales within 8000 m in a row!