Hi Hide :D I share some that history.
What I find with my Giotto is this. You want to rest the wand in the spout of the pitcher
so that the steaming wnad is angled to the centre of th jug.
At first open steam wand just slightly for about .5second and then open it up. Not so much so that you shoot the milk out the jug; but at a level that it starts to swirl. You dont want to keep adjusting it either, you must try and open the steam to the required level and not keep playing with it.
As the volume increases lower the jug by pulling away from the steam arm, which in turn will raise the wand. Once the volume has increased to say just above the bottom of the spout move the tip deeper in the milk until the tip is submerged and move the wand to the edge of the jug so that the milk spis faster. Once up to temp close wand off beneath the milk. Tap, swirl and pour.