I'm definitely no expert, Shayan, but your technique looked pretty good to me in that video!

In fact, those thrusts look like they'd be pretty effective (I definitely wouldn't want to be on the receiving end of one). Deep penetration isn't necessary to cause extensive damage.
Here's some of my comments from a recent thread on this issue:
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Certainly the extremely curved examples are nearly useless for a linear thrust, and far from optimal for any thrust, but a slash from an unmounted fighter would work just fine with those.
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As I said, it's a design that's far from optimal for the thrust, thus significantly limiting options for technique. I still wouldn't want to defend against someone on foot with one.
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http://www.vikingsword.com/vb/showth...hamshir+thrust
It looks like the sword you were using didn't have an extreme curvature. Have you tried similar thrusts with a more "curvy" sword?