It has long been a tradition that the best of the American builders file lugs thinner. We don’t taper the thickness so the edges blend into the tubes but we do thin them so they end up to be about a mm thick. This comes from a couple of influences. The first is that the father of American builders - Albert Eisentraut - did this and got a lot of publicity in American bicycling magazines in the 70’s. It became the defacto standard of judging quality. The second reason was that when we got back from our apprenticeships in Europe, we needed to visually show why our frames were better than our European competition (we didn’t compete against other at that time). Our spiel was that we not only took time to make frames look better where you could see it but also with alignment and mitering where you couldn’t.
There is plenty of meat on your Peugot lugs to thin them some, just don’t get carried away. I would start by evening the thickness all the way around. Pressed lugs are always uneven in thickness. Then you could evaluate whether you wanted to thin them more.
Start on the sides of the lugs first where it is more awkward to get a decent length file stroke. Be careful not to let the file slip off the lug onto the tube. This rounds the edge (the mark of an amateur). The top and bottom lug tips should be done last because it is easy by comparison to motor those down. Use a bastard cut file to hog off the offending bulk. Next go to a fine cut file to remove the file marks left by the bastards and then polish with 80 grit emery cloth to give a final smooth finish.