Leo: your impression is correct, according to the written explanation given to contractors for ConWay back in January. The fuel surcharge is derived from an unexplained "matrix", which formulates the fsc for that week, based upon the average price of diesel. This rate is of course higher for a D unit than a B, but is consistent for all loads during that week.
In January, the price I paid for fuel averaged $2.25, and the fsc was set at .09 cents per mile. In March, fuel averaged $2.40, and the fsc went up to .10 cents per mile. (These numbers apply to gasoline, for a B unit)
The jury is still out, but I'm seeing a definite drop in my income, (And I took my share of the low fsc loads, before this program began). For me, the biggest difference is that I can no longer accept more than mimimum deadhead - especially to relocate. If the deadhead is fairly high for a load, then I must negotiate for more money - and I don't enjoy that at all. If I enjoyed negotiating, I'd get my own authority, & negotiate my own rates, no?
Plus, every time I accept a load, I can't help but wonder if I should have tried to get more money - and that's something I like even less.
While I'm not ready to jump ship just yet, the picture is beginning to darken for me...