For the sake of training, I'm going to free-form dodge the attacks xD
As you move to make your first diagonal strike, I quickly shift my left foot behind my right, placing it firmly on the ground as I reverse my hands positions on the blade while lowering the pommel to my left hip to catch your blade.
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As your blow is deflected and you move into your second slash, I the point of my blade under yours as I hold the hilt of my blade above the right side of my head while not altering my foot position. This causes your blade to be safely deflected up the length of my blade, leaving you in a very open position as your hands and sword would now be above your head.
However, not taking advantage of the opening, I allow you to follow through with the vertical strike before I lift the tip of my blade up so now my entire weapon is above my head, horizontal to the ground with the tip pointed to my right. I also shift my right foot backwards to better cope with the weight of your slash, before throwing your blade off to my left side as I make a diagonal slash to your open neck area, stopping myself before the strike lands.
Alright, I've seen enough. You need to keep the opening slashes quick and short, utilising the one handed slashes, only placing your other hand on the hilt when you attempt the final power slash. For the opening slashes, try to aim the impact towards the tip of your weapon so ti doesn't get caught in your opponent's body, only using the mid-section of the blade for the finishing blow.
Now you will practice with a training dummy, to save me effort xD
Use your well trained taijutsu skills to deliver a couple of well placed punches, before drawing your sword and delivering two slashes to finish it. I prefer to use an upwards, diagonal, one-handed slash followed by a two handed slash that traces back along the same slash for the finish.