Thanks for the feedback. I don't think the issues you describe are 1.5 related. UGL is incompatible with concatenation, which is why it turns off the WordPress concatenation when enabled. Did that combo of plugins work with 3.3/1.2?
The querying doesn't happen often and won't cause constant change. Either Google has it or it doesn't. The only change is between those two states, and would happen one time, since once they are there they stay there.