you mention the lat machine not having increments of 5lbs.
Have you looked at the top of the machine? The one in the picture is similar to one at my gym, and there are some small round weights that you can lower to add 5 or 10 lbs to the stack. they are a little hard to see, but if you lower them down they sit right on top of the weight plate.
I discovered these by accident. Couldn't figure out why my usual weight felt so much tougher than usual. LOL
OK, the picture isn't showing up for me. Try this link.
http://bgifitnesscommercial.com/itemdetails.cfm?id=579
It's the 3rd machine on the page. HTH!