If you find a set up that works and use it every time,there is no reason to adjust anything,ever. I use the same watt bulbs all the time, my apt I keep about the same temp ur round. I NEVER have to adjust anything. And if the temps change a few degrees,it's really not a big deal,at all.
i also don't cover my entire UTH in foil tape,it's a waste. I tape mine on the outside. I run on strip running from one side if the mat to the other over leaping the foil holding the matt,no problems,EVER