I would speculate that your headlights are aligned properly at the factory. I personally would not manually adjust them, but if you are really concerned they are misaligned, have the dealer take a look at the alignment. What I think you are experiencing is the fact that headlights with LED technology are just that much brighter than halogens - yet the standard alignment for low beams (in accordance with DOT regulations) remains the same. I have noticed more cars on the road with very bright LED headlights (which appear to be high beams) during normal city driving, but I am pretty sure most people are not running around with their high beams on all of the time.
Think about it, bright LEDs coming at you on a slight hill can look like high beams, even though they are not. I think the drivers that are flashing you are confusing very bright LEDs with high beams. My F80 has LEDs, is 3 yrs old now, and I still sometimes get flashed as well with my low beams on. Or, those drivers that are flashing you are giving you the universal signal that there is a cop further up the road
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