But does it make a significant difference to the 2014's and beyond with their updated suspensions from the factory?

According to Peter Deron's "Morgan Three Wheeler" -- the 2014 has a version of the comfort update that's refined beyond the original update to the 2012-2013's. He wasn't specific about what those newer refinements were.

And maybe even further, do you need to be driving at 8/10ths to 9/10ths or more to get that advantage in the newer cars?

Some theoretical advantages may not have benefits large enough to make a practical difference.

Just asking. (May not be answerable.)

Thanks for the indulgence.