I'm sorry to hear that there have been so many problems with the PowerSun, the poor babies. MissT, be sure to let us know how the saline works, it seems like it may give Abu some relief. I've used it off & on to help with shedding that was either in the eye or right above it and the beardies didn't mind at all, it also did help.
Just a suggestion, but rather than using a flood lamp now, you think it might be easier on Abu's eyes just using standard household light bulbs? They might put out less of a glare and be easier on her eyes.
I have a T-Rex in Sabrina's tank and she has never had any eye issues at all. It's a 100 watt and is at a distance of 15" to get a temp of 105. Just thought I would mention that.