Had the same issue w/ our jib halyard. Inserted a piece of line inside the core and it works great. I had to pull a the section of core out of the cover to insert extra core then pull cover back over.
We have about three feet of space between the bridle ring to the pole and use 3/16 Dyneema. We sail in heavy air a lot so our fore guy is split and is just forward and outside the hatch. I plan on making them movable to the mast base as well.