Except for the 4 lb first aid kit, your list doesn't look unreasonable. I'm really surprised it came out to 60 lbs. First, I would collect all your stuff into your panniers, and weigh them using a bathroom scale to check that that's accurate. (Weigh yourself holding the panniers, then subtract your body weight.)

Next, if you have access to a small scale, weigh each item individually. It's tedious, but it really shows you where you can cut weight. (If you don't have one and can't borrow one, I've seen scales in post office lobbies. Go at a non-busy time and you basically have it to yourself.)

I would make specific suggestions, but based on your list I could only cut 5 lbs or so (9 if you count the 1st aid kit). At 60 lbs, you ought to be able to cut way more than that, so I'd want to straighten that out first.