Hey, I was searching all over the site to find this, I used it to setup my stuff and it is right on.
http://www.beardeddragon.org/forums/viewtopic.php?f=34&t=148006
Unless the overnight temp drops below 65F you do not need additional heat. Also, if the extra light you are using has more UVB also, take it out.The goal is light, you have enough UVB with the powersun and too much is bad as not enough. They need to photoregulate (control the amount of UVB exposure). Also, what are you using to measure temps? I know there is a digital probe temp at walmart for like $9 Acurite is what I think it is called. Saw it on this site somewhere. Some temp readers are not accurate and can be off by as much as 20 degrees.
I think there is a minimum distance recommended for the powersun 12" I think, if I am wrong I am sure someone will let you know. It can be confusing because some MVB's have minimum distances of 12-18" and other lighting
types don't.
I have a seperate UV/Heat setup as I think a lot do on here (from what I have read). Screens block ~30% of the UV so the dragon doesn't get as much that way, screen doesn't block out the heat so that is ok on it.
That link above will show you an easy setup that offers full UV availability for her; plus a TON of excellent information.
Here is an excellent site for food and nutrition
http://www.beautifuldragons.com/Nutrition.html
I hope that helps. If not, have you tried to PM Tracie (Drache613)? Excellent for help with everything especially difficult stuff.
-Vicki