Our Range Has A Simple Gas Oven As Well
If you make lots of pizzas you may wish to invest in a good quality pizza stone. You can bake pizzas, rolls, breads and other items right on the stone and it give near "Papa John's" results. Plus if you leave the stone in the oven (it goes on the lowest rack,not the oven floor), it helps to equalise the oven temp.
Using a thermometer will allow you to see if your oven is properly calibrated as well. If you set the dial for say 350F and the thermometer reads above or below by more than a few degrees then your oven's internal thermostat is off. Usually owner's manuals will speak to how to make adjustments.
For baking I find things are best done at the lowest or center rack position. If you haven't done so already get a good quality oven thermometer and check the temp of your oven at various levels. All non-convection ovens have not and cold spots to some degree. This can work well if you know where they are so you can tailor the area to suit whatever you are baking/roasting.
For gas ovens such as these remember heat comes from the bottom of the oven (under the floor) and rises, thus the lower part of the oven is usually a bit warmer due to natural convection air flows.
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