The tail curling is just a typical "I'm ready to go" stance, they usually do it while running around and stuff. About the water bowl, make sure that they don't sleep in it, if they do, they may get too cold, and problems could arise. Dragons often lick stuff, some more than others. You can probably see them, if you watch long enough, licking their log, rock and eachother, well actually they lick pretty much everything (at least my adults do, especially the male). Those temps will work for now, but you should definitely get something more accurate to measure them with. If it says 90* on the strip, the actual basking spot could be up anywhere from 100*-120* F.
-Drew
-Drew