Spin Halyard crane upgrade

[buchhla]

I am finally putting together my rigging plan for my pretorien. I have a Isomat NG70 mast section with the factory masthead unit which uses stemball fittings for the all of the stays. My question is that the forestay does not have any toggles installed. I also have a profurl R42 furling unit on it. My worries is that although the stemball theoretically has some movement, it would not be adequate to prevent premature stay wear. My current stay has broke strand at the stemball fitting which may have been caused by this. There is about 7 inches of space between the bottom of the fitting to where the wrapstop for the furling unit goes, so does it make sense to install a stemball eye with a swaged fork connecting to it? Since the stemball isn't permanently attached though, would this even make a difference since it could rotate out of position? The backstay has a double fork to allow for more movement, but I am not sure if there is a enough room for that up front.

Any ideas? The original setup has many ocean voyages on it, so it can't be that far off, just want to make sure that I do the replacement right!