To be honest, you might as well keep it at 1280. You see, I have a rather odd format for my Friends page -- my eyesight being what it is, I restrict the actual post width to 450 and the posts to (I think) 600. That's why the photos I post are thumbnailed to the size that they are. I wouldn't ask you to reduce things by that much, so what I may do is set up a Custom Friends group with everyone but you in it, and check your posts separately. I already do that with the "doctorwho" LJ community, which is otehrwise so prolific as to drown out everyone else!