Nice pictures all!
Bob, maybe I misunderstand, but what I think you have identified as Agave sisalana most certainly is not it. I do not even think it is an Agave. A. sisalana is a massive plant with stiff leaves that almost never curl or flop. It is still used heavily in the fiber industry.
You NOID might be Agave boldinghiana or Agave x celsii nova, or possibly A. mitis. Agave boldinghiana is a Caribbean species that I think would thrive on Hawaii.
Stush I think your issue with the A. victoriae-reginae is too much moisture either from watering or humidity, could be time for a much much faster draining mix.
I have been so focused on cactus flowers this year that I have not actually taken that many pictures of my Agaves, here are a few more from the Spring:
Agave 'Emerald Envy' came as Agave obscura, but it is unclear it is that and Agave marmorata:
Agave lophantha and Agave americana variegata:
Agave funkiana and Agave cerulata ssp. nelsoni
Agave montana and Agave sisalana:
