The front and back rows have the same number of files, but I also made the frontmost about an inch shorter than I should have, so that pushed a bunch of files from the front row to the middle.
I also wear out smaller files faster. I’ve worn out at least two of the hand-stitched
modelers Aurious I’ve bought over the years, because I use them while dovetailing. That’s one of the reasons I’m looking into making my own floats, which I should be able to resharpen, so they’ll last a lifetime.