Had the same thing in my area a couple years back, and what finally got the utility to move was logging it. I wrote down the date and time every single time the lights pulsed, took a video of it happening, and sent the whole list to the public utility commission in my state, not just the utility. Their own guys kept telling me it was nothing, but once the commission had a paper trail they sent someone out to check the connections at the transformer. Turns out a few of the new meters were wired in loose and it was causing voltage swings on our stretch of line. Took about a month but the flickering stopped after they came back through and fixed the connections. Get your neighbors to log it too, one complaint is easy to ignore, twenty is not.