Ibex... have you got any reply from Rock Exotica? You wrote "I will let you all know when I hear back from Rock Exotica" so I'd really know what was the official answer to your concerns.
If a super new skinny rope can actually be an issue with the SP, I simply think that the manual should be updated accordingly.
That manual covers plenty of things in accurate detail - as it should be for any climbing device, especially a solo one - and this info would be an important addition. After all, if the manual is not touched since decades as it looks (other than to replace "wren industries" with "rock exotica" on the cover, I mean) it would be simply fair and necessary to update it considering that probably single ropes as super-coated as the one you tested did not exist at the time the SP was engineered and released.