Thanks for the info, Gene
Your basking temp should be around 120f directly beneath the basking bulb on the basking surface which can be measured more easily with the IR gun. Assuming your warm side ambient temp is where it's supposed to be (mid-high 90s) I'd simply raise the basking surface up. If you're still having trouble with temps try either cutting a hole in the wire top to allow more direct light/heat in OR look into making a custom wood top. You should also consider adding another hide on the warm end--the tighter the fit/clearance the better (Uro's love to wedge into tight spaces). For their current size I'd say use a piece of ceramic flooring tile (make sure it's not coated), flagstone or slate and raise it about 1" above the tank floor. Be sure to use an additional piece of the same or similar material beneath it as it will insulate better than glass/paper towel.
Spring mix is good, but ensure that it does not contain any spinach, chard or kale. Also note that a lot of spring mixes have high percentages of greens with little nutrients (i.e. green/red lettuce, romaine). Greens like curly endive and escarole will provide a better staple diet. Also, you said you sprinkle the birdseed on the greens but you will be better off providing a separate shallow dish for seeds and (ground) lentils/navy beans.
Also, one more critical piece of information, since you went with Egyptians you will need a very large enclosure in the future--especially if you intend to house them together (which may be a bad plan based on the individuals temperaments/sex). As you may know this species is the largest of the genus often reaching lengths of around 3ft. As a rule of thumb an enclosure for a single adult uromastyx should be 4x it's adult length long by 2x it's length deep. Since Egyptians can grow up to and beyond 2.5ft they should have at the very least a 6x3 enclosure, preferably larger, and larger yet for two housed together (again, assuming that is an option, which it very well might not be).
I hope that helps
Matt
