Bill asked:Rick – How well would the Ratchamatic work if it wasn’t attached to a firm base – or would you recommend that I install them on the chainplates and eliminate the wires across the tramp?

Just like any other sheeting block, they do not have to be attached to a firm base. You do want to keep them straight and not roll over, etc. That is remedied in a couple of ways.
1)We used to bungee the cleat bail of the block forward or to the other block to stop them from turning over.
2)Use one of Harkens springy things that attaches below the block and between the block and the attachment point.

But, I am not sure what you are asking here, but you need to have the adjustability for your jib sheeting location. The 6.0 has really powerful sails and the jib leads need to be adjusted to various wind conditions.

Several of us got together and did some speed testing on the 6.0 when we first got our boats. We discovered that jib lead settings were highly important -- they needed to be adjusted to different wind conditions.

For example, in lighter air they performed better with the jib lead set in an a bit forward, although sheeting was very tender.
In heavier winds the leads went out and aft.., this allowed the slot to open more and thereby not backwind the mainsail.

I don't feel as if I am answering your question, however. Perhaps you might rephrase it.
Good luck,
Rick