Andrew,

About the slack thing in with a continuous line, run the aft portion through a turning block, that is attached near the rear beam with a length of bungy.

Then, if the spin needs for line to keep from distorting the shaple of the lower part of the spin much, it 'draws' it out via the bungy on the truning block.

This also keeps the slack tidied up some on the tramp.

You may do this already however.