thanks for the comments Andinista, i found i couldn't trim the jib correctly for any kind of upwind performance with the blocks in that forward position on the hulls. bringing the hull blocks further back would have helped close the slot a little but not as much as taking them back to the middle of the tramp has

perhaps that kind of barber hauler system is only used for downwind???

i haven't been all the way out on the trap as i haven't got a full harness and non-slip tape yet

but when getting over in the trap position that the angle between the mainsheet and mainsheet clamp isn't enough to get the sheet free with a simple pull and flick of the wrist

simple matter to adjust the clamp to a better angle when i get round to it

haven't had that problem with the jib blocks yet as sailing solo means i set and forget the jib before getting out on the hull