Can I do anything to make my gas oven better?
Is it safe to make it reach higher temperatures? The oven will contain metals, chemical coatings, seals, glass, and so on, and therefor the construction of it may only be safe for a certain temperature. Over heating it may make the materials expand too much, damage the seals, and heat adjoining units and cause extra damage (worse case scenario = house fire). I would suggest cooking for little longer at lower temperatures.