I guess I've got the advantage that I ride mod, but my 160mm is more than powerful enough for anything I put it through, it rarely slips and if it does it's only on ridiculous stuff which a maggie wouldn't have had a chance on. I have never not made a gap or anything because of brake slip, it just always holds. I've got a 4x rear wheel that I built myself (first ever wheel build) and that's holding up fine too, so I dunno... I know 160 on mod is more powerful than 203 on stock, but I'd never use anything else now. I've read stuff about the BB7's and BB5's not actually being that great on the rear, is there any way you could try your Hope on the rear?