I've already tried removing spacer on NDS of the wheel, but that gave other probs with disc alignment. May have another look at drive side, but couldn't see much opportunity there and no spacers. Was looking at a NOvatec hub, but that's 32H vs the current wheel being 36H, so options as I see it are (in no order of preference
1- cold setting
2 - revert to caliper braked rear
3- get new pair of wheels built up with novatec hubs, sell existing
4- sell rear wheel alone, get new rear wheel.
Perhaps I should start a referendum on it