It depends on the situation. If I want to break his gueard or force my way inside, then definately lean forward. If I want to stop-hit, or attack quickly then I dont lean at all. At six foot, I can throw this at chin height quickly with little effort. If I want to keep the guy back I MIGHT use a backwards leaning front kick like a thrusting Muay Thai type kick. Is would allow you to keep your head back and can be done reasonably quickly. Really to me though, there are a lot of drawbacks to this type of attack so I rarely us it. It would work well as a finisher if it landed though, like 300.
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"When I let Go of who I am, I become who I might be."
Lao Tzu