since I am not the only one who had problems with the first layer when it comes to bigger parts I developed a little Plugin that offers some optionsto reduce e.g. the pressure at the infill on the one hand and increase it at the walls, make a hop when travel and retract, and so on...for more informations see here:http://umforum.ultimaker.com/index.php?/topic/10175-my-plugin-damn-first-layer/