Just my 2 cents again but, I have seen where the bus bar was ruined when there were 2 large appliances on the same bus. For example a range was on the left side of a panel at took up spaces 1 and 3. Then on the right side in spaces 2 and 4 there was either an electric dryer or say a large central air conditioner that draws 40-50 amps. You would have a large load on those first top two bus bars. I have seen where the bus was warped, overheated and was damaged. You should check with the manufacture of the panel to see if there are any load restrictions. Some panels might say "no more than 80 or 90 amps. on any one bus bar".