As a PC user I never focussed too much on the mobile devices. Its a bit funny - on one hand most modern smartphones now have large screens and a high resolution, and especially tablets do not have any problem with Fudforum. On the other side Google is now stressing this, so we have to find a way.
So I think we don´t need a "perfect" thing, but something more flexible than the current tables, which indeed result in some strange layouts when being squezed in smaller formats.
The basic problem for a perfect solution is the high amount of options and links Fudforum is offering, as everything needs its space, and the content becomes less visible.
I like the way you deleted some columns !
To get a nice result for smaller mobiles we have to be pretty radical eliminating a lot of stuff to concentrate on the real core functions of the board.