I tried shortening my spin sheets and the block on a bungie at the back of the tramp, but then when I trapped out downwind, or when on a high, tight reach, the sheet was too short! So I added a pigtail from the clew, spiced into the sheet, and got rid of the block at the back.

Yeah, there is sheet all over the tramp when going upwind, but at least I get quick, clean jybes and have a long enough sheet for trapping out at the back of the boat.