Well, you may be heavy and having a death wish, but not all soldiers would just charge headlong into a wall of spears. Just like with horses you will have your surivial instinct kicking in and you will slow down. Of course some soldiers may continue to charge.

I cannot believe that medieval soldiers charged like that. The first rank might be able to contact with the enemy but then because of the speed there will be a clash of bodies resulting in grappling and wrestling. Then the second charging rank would arrive. If they also charge like you described than there would quickly be one big pile of soldiers on top of each other as men come charging in as fast as they can.

And isn't double time twice as fast as walking? That would be 10 km/h. That would be realistic but seeing armoured men walking at 17 km/h as if they were featherweights comes across as unbelieveable to many. Seeing that you immediately breaks the illusion of being there on the battlefield and makes TW quite clearly a game, an overdramatized game.